One of the subdivisions, of more importance than genus, into which certain families are divided.

(biology) a taxonomic category below a family

A subset of the members of a family that have some set of common characteristics not shared by any members of the family outside that subset. See subdomain.

A married couple (with or without children) or a single parent with one or more never-married children under the age of 18, residing with and related to the householder, but not including the householder or the householder's spouse. When grown children move back to the parental home with their own children or spouse, they are considered a subfamily. Related terms: Family, Householder