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 .
relating to, belonging to, having the nature of, or resembling: herbaceous, larvaceous

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.”
A suffix used to form adjectives meaning “made of” or “resembling” a particular substance or material, such as silicaceous, containing silicon.

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