Knifeshaped

Part of speech: adjective

Definitions

1. Having a form or outline resembling that of a knife, typically long, flat and tapering to a sharp edge
2. Shaped like a blade with a thin profile and a pointed or sharpened end, as a knife is
3. Describing something whose outline or contour matches the narrow, edged form of a cutting knife

Etymology: Knifeshaped is a plain compound, built from "knife" and "shaped," the past participle of the verb "shape." Old English "cnif" originally named a pointed cutting instrument, and "shape" comes from Old English "gesceap" and related forms, meaning to form or create. Joining the two gives a transparent description of something formed like a knife blade: thin, edged, and tapering to a point. English readily produces this kind of adjective by pairing a noun with a participle, so the word needs no special story beyond that. Its use is almost entirely descriptive, most often in botany, zoology and anatomy, where leaves, petals, fins or bones are compared to a blade. Because the formation is so transparent, writers coin such compounds freely when a more specific term is not already in use.