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a suffix with the meanings “resembling, having the nature of,” “made of,” occurring in loanwords from Latin (cretaceous; herbaceous) and forming adjectives in English on the Latin model (ceraceous), especially adjectival correspondents to taxonomic names ending in -acea, and -aceae: rosaceous .
Origin of -aceous
< Latin -āceus; see -ous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for -aceous


relating to, belonging to, having the nature of, or resembling: herbaceous, larvaceous
Word Origin
New Latin, from Latin -āceus of a certain kind; related to -āc,-āx, adjectival suffix
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for -aceous

word-forming element denoting "belonging to, of the nature of," from Latin -aceus, enlarged form of adjectival suffix -ax (genitive -acis); see -acea. Especially in biology, "pertaining to X order of plants or animals."

Online Etymology Dictionary, © 2010 Douglas Harper
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-aceous in Science
A suffix used to form adjectives meaning "made of" or "resembling" a particular substance or material, such as silicaceous, containing silicon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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