cultrateyoudaoicibaDictYouDict[cultrate 词源字典]
"Formed like the blade of a knife or ploughshare; especially curved with a pointed end, often with one flattened and one sharp edge, like a pruning knife", Early 19th cent.; earliest use found in William Turton (1762–1835), conchologist. From classical Latin cultrātus shaped like a knife (Pliny) from cultr-, culter knife, share + -ātus.[cultrate etymology, cultrate origin, 英语词源]