a. Of or relating to: amylaceous.
b. Resembling or having the nature of: amentaceous.
2. Belonging to a taxonomic group: orchidaceous.
[From Latin -āceus.]
suffix forming adjectives
relating to, belonging to, having the nature of, or resembling: herbaceous; larvaceous.
[New Latin, from Latin -āceus of a certain kind; related to -āc, -āx, adjectival suffix]
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, esp. adjectival correspondents to taxonomic names ending in -acea and -aceae: rosaceous.
[< Latin -āceus; see -ous]
A suffix used to form adjectives meaning "made of" or "resembling" a particular substance or material, such as silicaceous, containing silicon.