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 The Organization of Scientific Area Committees for Forensic Science
    
      
  OSAC Lexicon

The OSAC Lexicon is a compendium of forensic science terms and definitions. This terminology tool was created to help bring consistency and understanding to the way terms are used by the various forensic science. Use of the OSAC Lexicon does not replace the need to reference the original published source.

The terms and definitions in the OSAC Lexicon come from the published literature, including documentary standards and technical reports. It is continually updated with the latest work from OSAC units, as well as terms from newly published documentary standards and standards elevated to the OSAC Registry.

Gradually terms are evaluated and harmonized by the OSAC to a single term. This process results in an OSAC Preferred Term. An OSAC Preferred Term is a term, along with its definition, that has undergone review and evaluation by the FSSB Terminology Task Group and has been approved by the FSSB. The FSSB recommends that subcommittees use OSAC Preferred Terms when drafting standards.

The OSAC Lexicon should be the primary resource for terminology and used when drafting and editing forensic science standards and other OSAC work products.



Keyword Search
  
  
  Searches term, definition, and source for any of these keywords.
  Term
  
  
  Searches term name.
  OSAC Committee
  
  
  - Any -Bloodstain Pattern AnalysisCrime Scene Investigation & ReconstructionDigital EvidenceDogs & SensorsFacial and Iris IdentificationFire & Explosion InvestigationFirearms & ToolmarksFootwear & TireForensic AnthropologyForensic Document ExaminationForensic NursingForensic OdontologyForensic ToxicologyFriction RidgeFSSBHuman Forensic BiologyIgnitable Liquids, Explosives & Gunshot ResidueInterdisciplinaryMedicolegal Death InvestigationSeized DrugsSpeaker RecognitionTrace MaterialsVideo/Imaging Technology & AnalysisWildlife Forensic Biology
  Standard
  
  
  Searches standard designation number.
  Items Per Page
  
  
  5102550
  Only OSAC Preferred

AllABCDEFGHIJKLMNOPQRSTUVWXYZ0-9#

Displaying 1 - 9 of 9
      Export results (CSV)Y-Str
  Short tandem repeat markers found on the Y-chromosome that enable male-specific DNA testing and can be useful in cases involving sexual assault; variations in Y-STRs may be used for distinguishing individuals, and in biological relationship and ancestry testing.
            
            Committee
                    Human Forensic Biology

            Date Added to Lexicon
                                06/12/2023

            **Standard Source** (Designation Number Title of Standard. Publisher, Place, Year.)
          ANSI/ASB 022 Standard for Forensic DNA Analysis Training Programs. AAFS Academy Standards Board (ASB), 410 North 21st Street, Colorado Springs, CO 80904, 2019.
                          Source link
      Term link
  Yarn
  a generic term for a continuous strand of textile fibers, filaments, or material in a form suitable for knitting, weaving, or otherwise intertwining to form a textile fabric.
            
            Committee
                    Trace Materials

            Date Added to Lexicon
                                06/12/2023

            **Standard Source** (Designation Number Title of Standard. Publisher, Place, Year.)
          ANSI/ASTM E2225-23 Standard Guide for Forensic Examination of Fabrics and Cordage. ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428, 2023.
                          Source link
                  *Reprinted, with permission, from ASTM, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, https://www.astm.org*
      Term link
  Yarn
  A generic term for a continuous strand of textile fibers, filaments, or material in a form suitable for knitting, weaving, or otherwise intertwining to form a textile fabric. DiscussionFor the purposes of this guide, yarn refers to lengths of fiber reinforcement (for example, twisted staple fibers, filament fibers).
            
            Committee
                    Trace Materials

            Date Added to Lexicon
                                06/12/2023

            **Standard Source** (Designation Number Title of Standard. Publisher, Place, Year.)
          ANSI/ASTM E3260-21 Standard Guide for Forensic Examination and Comparison of Pressure Sensitive Tapes. ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428, 2021.
                          Source link
                  *Reprinted, with permission, from ASTM, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, https://www.astm.org*
      Term link
  Yarn
  A generic term for a continuous strand of textile fibers, filaments, or material in a form suitable for knitting, weaving, or otherwise intertwining to form a textile fabric
            
            Committee
                    Interdisciplinary

            Date Added to Lexicon
                                06/12/2023

            **Standard Source** (Designation Number Title of Standard. Publisher, Place, Year.)
          ANSI/ASTM E1732-24 Standard Terminology Relating to Forensic Science. ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428, 2024.
                  *Reprinted, with permission, from ASTM, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, https://www.astm.org*
      Term link
  Yaw
  In facial identification, an intrinsic rotation of the head about a vertical (longitudinal) axis measured in degrees. DISCUSSIONFrontal poses have a yaw angle of 0. Positive angles represent faces looking to their left (a counter-clockwise rotation around the axis). The yaw axis is typically defined as the Y-axis (positive up).
            
            Committee
                    Facial and Iris Identification

            Date Added to Lexicon
                                06/12/2023

            **Standard Source** (Designation Number Title of Standard. Publisher, Place, Year.)
          ANSI/ASTM E2916-19e1 Standard Terminology for Digital and Multimedia Evidence Examination. ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428, 2019.
                          Source link
                  *Reprinted, with permission, from ASTM, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, https://www.astm.org*
      Term link
  Yaw
  In facial identification, an intrinsic rotation of the head about a vertical (longitudinal) axis measured in degrees
            
            Committee
                    Interdisciplinary

            Date Added to Lexicon
                                06/12/2023

            **Standard Source** (Designation Number Title of Standard. Publisher, Place, Year.)
          ANSI/ASTM E1732-24 Standard Terminology Relating to Forensic Science. ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428, 2024.
                  *Reprinted, with permission, from ASTM, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, https://www.astm.org*
      Term link
  Yield, Expected
  The quantity of material or the percentage of theoretical yield anticipated at any appropriate phase of production based on previous laboratory, pilot scale, or manufacturing data.
            
            Committee
                    Seized Drugs

            Date Added to Lexicon
                                06/12/2023

            **Standard Source** (Designation Number Title of Standard. Publisher, Place, Year.)
          ANSI/ASTM E2882-19 Standard Guide for Analysis of Clandestine Drug Laboratory Evidence. ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428, 2019.
                          Source link
                  *Reprinted, with permission, from ASTM, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, https://www.astm.org*
      Term link
  Yield, Expected
  The quantity of material or the percentage of theoretical yield anticipated at any appropriate phase of production based on previous laboratory, pilot scale, or manufacturing data
            
            Committee
                    Interdisciplinary

            Date Added to Lexicon
                                06/12/2023

            **Standard Source** (Designation Number Title of Standard. Publisher, Place, Year.)
          ANSI/ASTM E1732-24 Standard Terminology Relating to Forensic Science. ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428, 2024.
                  *Reprinted, with permission, from ASTM, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, https://www.astm.org*
      Term link
  Yield, Theoretical
  The quantity that would be pro- duced at any appropriate phase of production based upon the quantity of material to be used, in the absence of any loss or error in actual production.
            
            Committee
                    Seized Drugs

            Date Added to Lexicon
                                06/12/2023

            **Standard Source** (Designation Number Title of Standard. Publisher, Place, Year.)
          ANSI/ASTM E2882-19 Standard Guide for Analysis of Clandestine Drug Laboratory Evidence. ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428, 2019.
                          Source link
                  *Reprinted, with permission, from ASTM, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, https://www.astm.org*
      Term link
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