nounWord forms: plural ˈsubˌfamilies
1. any main natural subdivision of a family of plants or animals
2. a major division of a language family, above a branch
⇒ the Balto-Slavic subfamily of Indo-European languages
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.