-acea

-acea

suffix forming plural proper nouns
denoting animals belonging to a class or order: Crustacea (class); Cetacea (order).
[New Latin, from Latin, neuter plural of -āceus -aceous]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

-acea

a suffix used in the formation of names of zoological classes and orders: Crustacea.
[< Latin, neuter pl. of -āceus. See -aceous]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.