Caltrop

[kæltrәp]

解释:

(noun.) tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed.

校对:梅勒妮--From WordNet

解释:

(n.) Alt. of Caltrap

校对:莱利亚

解释:

n. an instrument armed with four spikes so arranged that one always stands upright used to obstruct the progress of an enemy's cavalry or of besiegers of a fortification.—Also Cal′trap.

贺拉斯校对