Trapa
noun
ˈtrāpə,
-rapə
: a small Old World genus of aquatic herbaceous plants with finely dissected submerged leaves, rhombic floating leaves that have inflated spongy petioles, and solitary white flowers followed by horned or spiny fruits see trapaceae , water chestnut
Word History
Etymology
New Latin, probably short for (assumed) Medieval Latin calcitrappa caltrop