[1770–80; ‹ NL olīvāceus, equiv. to L olīv(a) olive + -āceus-aceous]This word is first recorded in the period 1770–80. Other words that entered Englishat around the same time include: advisory, charade, crescendo, red flag, taboo-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)