water chestnut Meaning, Definition & Usage

  1. noun a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits
    water chestnut plant; caltrop.
  2. noun Chinese sedge yielding edible bulb-shaped tubers
    Eleocharis dulcis; Chinese water chestnut.
  3. noun edible bulbous tuber of a Chinese marsh plant

WordNet

Wa"ter chest"nut
Definitions
  1. (Bot.) The fruit of Trapa natans and Trapa bicornis, Old World water plants bearing edible nutlike fruits armed with several hard and sharp points; also, the plant itself; -- called also water caltrop.

Webster 1913