Definition

1. Noun:
   • A spiked metal device: A small, multi-pronged metal object designed to impede movement, historically used in warfare to injure feet or puncture tires.
   • A type of aquatic plant: A plant of the genus Trapa, bearing a distinctive spiny, nut-like fruit; also known as a water chestnut.
   • A type of weed: A low-growing, often poisonous plant (genus Tribulus or Kallstroemia) with spiny fruit that can injure animals and is a pest in pastures.

Usage Examples

• Noun (Military/Obstacle):
  • The knights scattered caltrops on the field to stop the charging cavalry.
  • Modern security forces sometimes use tire caltrops to disable vehicles.
• Noun (Plant - Trapa):
  • The pond was covered with the broad leaves of the caltrop.
  • The edible fruit of the water caltrop is a delicacy in some Asian cuisines.
• Noun (Plant - Weed):
  • The pasture was infested with puncture vine, a type of caltrop.
  • The sheep avoided the area where the spiky caltrop grew.

Advanced Usage

• "To sow/seed with caltrops": To strategically place these devices as a defensive measure.
  • The defenders sowed the approach to the gate with caltrops.
• Used metaphorically to describe a hidden or widespread hazard.
  • The legal landscape was a minefield of regulatory caltrops.

Variants and Related Words

• Water caltrop (n): Specifically refers to the aquatic plant ( or similar species).
• Caltrap (n): An alternate, less common spelling for the metal device.
• Tribulus terrestris (n): The scientific name for the puncture vine, a common weedy caltrop.

Synonyms

• Crow's foot (n): A synonym for the metal anti-personnel/vehicle device.
• Puncture vine (n): A common name for the weedy plant .
• Water chestnut (n): A common name for the edible aquatic plant (though this can refer to different plants).

Related Phrases

• "To encounter a caltrop": To unexpectedly meet with a hidden obstacle or danger.
  • Their advance was halted when the lead vehicle encountered a caltrop.
• "Caltrop field": An area deliberately seeded with these devices.
  • The map marked the suspected caltrop field ahead.

Noun

1. Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America
2. a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits
3. tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed