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English word
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
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WORDNET DICTIONARY
Noun caltrop has 3 senses
- caltrop(n = noun.plant) devil's weed, tribulus terestris - tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed; is a member of genus tribulus, tribulus
- caltrop(n = noun.plant) water chestnut, water chestnut plant - a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits; is a member of genus trapa, trapa
- caltrop(n = noun.plant) centauria calcitrapa, star-thistle - Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America; is a kind of centaury
is a kind of subshrub, suffrutex
has particulars: jesuits' nut, trapa natans, water caltrop, ling, ling ko, trapa bicornis
is a kind of aquatic plant, hydrophyte, hydrophytic plant, water plant
CIDE DICTIONARY
caltrop, n. [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.].
- A genus of herbaceous plants (
Tribulus ) of the orderZygophylleæ , 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] - 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]
OXFORD DICTIONARY
caltrop, n. (also caltrap)
1 hist. a four-spiked iron ball thrown on the ground to impede cavalry horses.
2 Heraldry a representation of this.
3 any creeping plant of the genus Tribulus, with woody carpels usu. having hard spines.
1 hist. a four-spiked iron ball thrown on the ground to impede cavalry horses.
2 Heraldry a representation of this.
3 any creeping plant of the genus Tribulus, with woody carpels usu. having hard spines.
Etymology
(sense 3) OE calcatrippe f. med.L calcatrippa: (senses 1-2) ME f. OF chauchetrape f. chauchier tread, trappe trap: ult. the same word