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WordReference Random House Unabridged Dictionary of American English © 2024cal•trop (kal′trəp),USA pronunciation n. - Plant Biologyany of several plants having spiny heads or fruit, as those of the genera Tribulus and Kallstroemia, or the star thistle, Centaurea calcitrapa.
- Militaryan iron ball with four projecting spikes so disposed that when the ball is on the ground one of them always points upward: used to obstruct the passage of cavalry, armored vehicles, etc.
Also, cal•throp (kal′thrəp),USA pronunciation cal′trap. - Latin calci-, stem of calx spur, heel) + træppe trap1
- Middle English calketrappe, Old English calcatrippe, colte-træppe, equivalent. to calce- (bef. 1000
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