of the nature of, resembling, or containing butter
Word origin
[1660–70; ‹ L būtȳr(um) butter + -aceous]This word is first recorded in the period 1660–70. Other words that entered Englishat around the same time include: adhesive, cantilever, joke, saturated, vocalize-aceous is a suffix with the meanings “resembling, having the nature of,” “made of,” occurringin 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)