Definition of caltrop in US English:

caltrop

noun

  • 1A spiked metal device thrown on the ground to impede wheeled vehicles or (formerly) cavalry horses.

    • ‘The entrance where journalists are allowed to go in looks like Normandy Beach, with tank caltrops, razor wire and sandbagged defensive positions that have taken over half of the square.’
    • ‘It was a combination of towers, palisades, ditches, abatis, and caltrops to slow the attacking Gauls, so that Roman missile engines could more effectively engage them.’
    • ‘The plot progresses like a horse marching over caltrops, jerking wildly every time its foot encounters the next point.’
    • ‘He didn't know what weapon he possessed, if any, beyond the caltrops.’
    • ‘A caltrop is a military device consisting of four metal spikes arranged so that, whichever way it falls, at least one spike points upwards.’
  • 2A creeping plant with woody carpels that typically have hard spines and resemble military caltrops.

    Genus Tribulus, family Zygophyllaceae

    • ‘Caltrop is quite rare in Cottesloe, as far as I know, and it looks like this infestation may have been introduced during works associated with the path construction, perhaps.’
    • ‘Caltrop is an herbaceous annual that commonly grows prostrated on the ground.’
    • ‘Caltrop is a perennial herb that can infest a wide variety of crops and pastures.’
  • 3

    another term for water chestnut (sense 3)

Origin

Old English calcatrippe, denoting any plant which tended to catch the feet, from medieval Latin calcatrippa, from calx ‘heel’ or calcare ‘to tread’ + a word related to trap. caltrop (sense 1) was probably adopted from French.

Pronunciation

caltrop

/ˈkaltrəp//ˈkæltrəp/