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niggerhead

['niɡəhed]

n. 黑胶砾；低劣的橡胶

英文词源

niggerhead (n.): from nigger + head. A term used formerly in U.S. of various things, such as "cheap tobacco" (1843), "protruding root mass in a swamp" (1859), a type of cactus (1877), and the black-eyed susan (1893). Variant negro-head attested from 1781.