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-aceous

American  
  1. 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.


-aceous British  

suffix

  1. relating to, belonging to, having the nature of, or resembling

    herbaceous

    larvaceous

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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


Etymology

Origin of -aceous

< Latin -āceus; -ous