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  1. a suffix used in the formation of names of families: Rosaceae.
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Origin of -aceae

< Latin, feminine plural of -āceus. See -aceous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -aceae


suffix forming plural proper nouns
  1. denoting plants belonging to a familyLiliaceae; Ranunculaceae
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Word Origin

New Latin, from Latin, feminine plural of -āceus -aceous
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012