oligoester
an ester oligomer chain containing a small number of repeating ester units (monomers). (Oligoesters are short analogs of polymeric polyesters.)

oligoesters
plural of oligoester

oligohypomenorrhea
Decreased frequency of menstruation, as well as a reduced amount of blood loss with each menstrual episode.

oligomeganephronia
A kidney disease characterised by larger nephrons that are reduced in number

oligomeganephronias
plural of oligomeganephronia

oligonutrient
A micronutrient that is needed in slightly larger amounts

oligonutrients
plural of oligonutrient

oligopeptide
A peptide containing a relatively small number of amino acids

oligopeptides
plural of oligopeptide

oligopolies
plural of oligopoly

oligopolist
A member of an oligopoly; one of a small number of sellers with undue influence over a market.

oligopolists
plural of oligopolist

oligopoly
An economic condition in which a small number of sellers exert control over the market of a commodity.

oligoprogenitor
One of a small number of progenitors

oligoprogenitors
plural of oligoprogenitor

oligopsonies
plural of oligopsony

oligopsonist
Any of a relatively small number of buyers of a product or service

oligopsonists
plural of oligopsonist

oligopsony
An economic condition in which a small number of buyers exert control over the market price of a commodity.

oligosiderite
A meteorite characterised by a small amount of metallic iron.

oligosiderites
plural of oligosiderite

oligosilane
Any polysilane with a relatively low number of silane units

oligosilanes
plural of oligosilane

oligosiloxane
Any polysiloxane having a relatively small number of -Si-O- groups

oligosiloxanes
plural of oligosiloxane

oligostilbene
Any polystilbene with a relatively low number of stilbene units.

oligostilbenes
plural of oligostilbene

oligosynthesis
The synthetic combining of a relatively small number of morphemes to form compound words.

oligotaxy
The decrease in the number of whorls in a flower.

oligoubiquitin
A small number of linked ubiquitin molecules, especially when formed by oligoubiquitination

oligoubiquitination
Repeated ubiquitination to add a small number of ubiquitin molecules

oligoubiquitins
plural of oligoubiquitin

oligozeugodactyly
The possession of several zeugopoda

oligozoospermia
The condition where low numbers of spermatozoa are produced in an ejaculation.

oligozoospermias
plural of oligozoospermia

ollock
An Indian measure of capacity of about 200 millilitres.

ollocks
plural of ollock

ombrograph
A rain gauge used as an instrument for recording the time of occurrence, quantity, and rapidity of rainfall.

ombrographs
plural of ombrograph

ombrotype
A type of climate that has a certain amount of rainfall

ombrotypes
plural of ombrotype

omer
A former small Hebrew unit of dry volume equal to about 2.3 L or 2.1 quarts.
A vessel of one omer.
The sheaf of barley offered on the second day of Passover.

omers
plural of omer

omnibi
plural of omnibus

omnitruncation
An operation applied to a regular polytope in a Wythoff construction that creates a maximum number of facets.

omnitruncations
plural of omnitruncation

onslaught
A fierce attack.
A large number of people or things resembling an attack.

onslaughts
plural of onslaught

oodle
singular of oodles

oodles
unspecified large amount, number, or quantity; lots, tons.

oodlins
Alternative form of oodles (“lots; a great number or amount”).

oomycete
Any of a number of filamentous unicellular protists of the class Oomycetes; the water molds.

oomycetes
plural of oomycete

opacimeter
Any instrument that measures opacity

opacimeters
plural of opacimeter

opacities
plural of opacity

opacity
The state or quality of being opaque, not allowing light to pass through.
The state or quality of being inaccessible to understanding.
A measure of relative impenetrability to electromagnetic radiation such as light.
An opaque area.

opaqueness
Synonym of opacity.

opaquenesses
plural of opaqueness

openings
plural of opening

operad
A set of operations, each one having a fixed finite number of arguments and one output, which can be composed with others.

operads
plural of operad

operand
A quantity to which an operator is applied (in 3-x, the operands of the subtraction operator are 3 and x).

operands
plural of operand

operon
A unit of genetic material that functions in a coordinated manner by means of an operator, a promoter, and structural genes that are transcribed together.

operons
plural of operon

optima
plural of optimum

optimeter
A form of interferometer used in the measurement of gauge blocks.
Alternative form of optometer (“eye-measuring instrument”).

optimeters
plural of optimeter

optimums
plural of optimum

optode
An optical sensor device that optically measures a specific substance.

optodes
plural of optode

optodynamics
A range of dynamic measurement techniques that use small lasers.

optrode
Alternative spelling of optode.

optrodes
plural of optrode

oracies
plural of oracy

oracy
The ability to speak, and to understand spoken language
A measure of this ability

oralloy
Highly-enriched uranium.

orchardful
The quantity or number which fills an orchard.

orchardfuls
plural of orchardful

orchardsful
plural of orchardful

ordinalities
plural of ordinality

ordinality
The state or condition of being ordinal.
A number indicating the position of something in a series or order.

ordinals
plural of ordinal

organoactinide
any organometallic compound of an actinide, especially one having an unusually high coordination number

organoactinides
plural of organoactinide

orgue
Any of a number of long, thick pieces of timber, pointed and shod with iron, and suspended, each by a separate rope, over a gateway, to be let down in case of attack.
A piece of ordnance, consisting of a number of musket barrels arranged so that a match or train may connect with all their touchholes, and a discharge be secured almost or quite simultaneously.

orgues
plural of orgue

oropendola
Any of a number of tropical birds related to the caciques, mostly in the genus Psarocolius, and, like the caciques, noted for living communally in large, hanging basket nests.

oropendolas
plural of oropendola

orthoacid
the member of a series of oxyacids of a particular element that has the highest number of hydroxyl groups

orthoacids
plural of orthoacid

orthoamphibolite
Metamorphic rock composed mostly of amphibole, plagioclase, with lesser amounts of epidote, zoisite, chlorite, quartz, titanite, and accessory leucoxene, ilmenite and magnetite derived from an igneous rock.

orthoamphibolites
plural of orthoamphibolite

orthosomnia
An unhealthy obsession with achieving the correct amount and type of sleep.

orvietite
A mineral consisting of a mixture of plagioclase and sanidine with smaller amounts of leucite and augite, etc.

oscillator
A tuned electronic circuit used to generate a continuous output waveform.
An instrument for measuring rigidity by the torsional oscillations of a weighted wire.
A pattern that returns to its original state, in the same orientation and position, after a finite number of generations.

oscillators
plural of oscillator

oscillometer
Any of several devices that measure oscillations
A device that measures the roll (or pitch) of a ship

oscillometers
plural of oscillometer

oscillotonometer
A form of sphygmomanometer (for measuring blood pressure) that employs two alternating cuffs that measure systolic and diastolic pressures

oscillotonometers
plural of oscillotonometer

osculatrices
plural of osculatrix

osculatrix
A curve whose contact with a given curve at a given point is of a higher order (or involves the equality of a greater number of successive differential coefficients of the ordinates of the curves taken at that point) than that of any other curve of the same kind.

osmol
Alternative form of osmole.

osmole
A unit of measurement, a mole of an osmotically active compound

osmoles
plural of osmole

osmols
plural of osmol