caltrop
UK /ˈkaltɹəp/ · US /ˈkæltɹəp/ noun
Forms caltrops
- noun (weaponry) A metal object, usually small, with spikes arranged so that, when thrown onto the ground, one always faces up as a threat to pedestrians, horses, and vehicles (also used as a heraldic charge).
- noun (colloquial) The starthistle, Centaurea calcitrapa, a plant with sharp thorns.
- noun Any of a number of flowering plants in the family Zygophyllaceae, including several members of the genus Kallstroemia and the species Tribulus terrestris, native to warm temperate and tropical regions.
Synonyms
crow's foot crowfoot jackrock cheval trap knapweed devil's weed Tribulus terestris water chestnut water chestnut plant star-thistle Centauria calcitrapa
Etymology
From Middle English calketrappe, from Old English calcatrippe, from Medieval Latin calcatrippa (“thistle”), from Latin calx or calcare (“to tread”) + trappa (“trap”).
Webster’s 1913
- noun A genus of herbaceous plants (Tribulus) of the order Zygophylleæ, 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.
- noun 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.
Etymology [OE. calketrappe, calletrappe, caltor (in both senses), fr. AS. collræppe, 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.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “caltrop”, CC BY-SA 4.0. Details