- a taxonomic group that is a subdivision of a family
- any analogous subdivision, as of a family of languages
WordReference Random House Unabridged Dictionary of American English © 2020
- Biologya category of related genera within a family.
- Linguistics(in the classification of related languages within a family) a category of a higher order than a branch. Cf. branch (def. 8), family (def. 14).
- sub- + family 1825–35