Term: mother-in-law: the mother of your spouse
Broader: progenitor: an ancestor in the direct line | Unrelated: old boy: a former male pupil of a school
Broader: progenitor: an ancestor in the direct line | Unrelated: inachis: a genus of Nymphalidae
Broader: progenitor: an ancestor in the direct line | Unrelated: contamination: the act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors
Broader: progenitor: an ancestor in the direct line | Unrelated: trammel: an adjustable pothook set in a fireplace
Broader: progenitor: an ancestor in the direct line | Unrelated: millboard: stout pasteboard used to bind books
Broader: progenitor: an ancestor in the direct line | Unrelated: prairie: a treeless grassy plain
Broader: progenitor: an ancestor in the direct line | Unrelated: east wind: a wind from the east
Broader: progenitor: an ancestor in the direct line | Unrelated: air reconnaissance: reconnaissance either by visual observation from the air or through the use of airborne sensors
Broader: progenitor: an ancestor in the direct line | Unrelated: digital communications technology: the design and construction of communications technology that transmits information in digital form
Broader: progenitor: an ancestor in the direct line | Unrelated: victualer: an innkeeper (especially British)