pə̇ˈsōnēə, pīˈs- noun
Usage: capitalized
Etymology: New Latin, irregular from Willem Piso died ab 1678 Dutch physician and traveler + New Latin -ia
: a genus of tropical often thorny trees, shrubs, and vines (family Nyctaginaceae) having small dioecious apetalous flowers and utricular fruits — see cockspur 2b