sag·it·tar·ia \ˌsajəˈta(a)rēə\noun Usage: capitalized Etymology: New Latin, from Latin sagitta + New Latin -aria : a genus of aquatic herbs (family Alismataceae) of temperate and tropical regions having basal often sagittate or hastate leaves and scapose flowers with 3 sepals and 3 deciduous white petals — see arrowhead, wapatoo