WordReference Random House Unabridged Dictionary of American English © 2020
-aceous, 
  • Biologya 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), esp. adjectival correspondents to taxonomic names ending in  -acea and  -aceae: rosaceous.
    • Latin -āceus; see -ous

    Collins Concise English Dictionary © HarperCollins Publishers::
    -aceous suffix forming adjectives
    1. relating to, belonging to, having the nature of, or resembling: herbaceous, larvaceous
    Etymology: New Latin, from Latin -āceus of a certain kind; related to -āc,-āx, adjectival suffix
    '-aceous' also found in these entries (note: many are not synonyms or translations):
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