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caltrop n. 拦路钩 拦路钩 caltrop n 1: tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed [ synonym: { caltrop}, { devil' s weed}, { Tribulus terestris}] 2: a plant of the genus Trapa bearing spiny four- pronged edible nutlike fruits [ synonym: { water chestnut}, { water chestnut plant}, { caltrop}] 3: Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine- tipped scales; naturalized in America [ synonym: { star- thistle}, { caltrop}, { Centauria calcitrapa}] Caltrop \ Cal" trop\, Caltrap \ Cal" trap\, n. [ OE. calketrappe, calletrappe, caltor ( in both senses), fr. AS. collr[ ae] ppe, calcetreppe, sort of thistle; cf. F. chaussetrape star thistle, trap, It. calcatreppo, calcatreppolo, star thistle. Perh. from L. calx heel the same word as E. trap. See 1st { Trap}.] 1. ( Bot.) A genus of herbaceous plants ({ Tribulus}) of the order { Zygophylle[ ae]}, having a hard several- celled fruit, armed with stout spines, and resembling the military instrument of the same name. The species grow in warm countries, and are often very annoying to cattle. [ 1913 Webster] 2. ( Mil.) An instrument with four iron points, so disposed that, any three of them being on the ground, the other projects upward. They are scattered on the ground where an enemy' s cavalry are to pass, to impede their progress by endangering the horses' feet. [ 1913 Webster]
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