Caltrop

//ˈkæltɹəp// noun, slang

Definitions

Noun
  1. 1
    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).

    "[…] her father, the emperor Alexius, who reigned AD 1081-1118, ordered caltrops to be cast in front of his archers […]"

  2. 2
    Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America wordnet
  3. 3
    The starthistle, Centaurea calcitrapa, a plant with sharp thorns. colloquial
  4. 4
    a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits wordnet
  5. 5
    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.
Show 1 more definition
  1. 6
    tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed wordnet

Etymology

From Middle English calketrappe, from Old English calcatrippe, from Medieval Latin calcatrippa (“thistle”), from Latin calx or calcare (“to tread”) + trappa (“trap”).

Next best steps

Mini challenge

Unscramble this word: caltrop