One of the mysteries of the English language finally explained.
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 century; earliest use found in William Turton (1762–1835), conchologist. From classical Latin cultrātus shaped like a knife (Pliny) from cultr-, culter knife, share + -ātus.
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