The Collaborative International Dictionary
ostracoid
ostracoid \os"tra*coid\, a. (Zo["o]l.) Of or pertaining to the Ostracoidea (now Ostracoda). -- n. One of the Ostracoidea (now Ostracoda).
Wiktionary
ostracoid
a. (context zoology English) Of or pertaining to the Ostracoidea. n. (context zoology English) Any of the Ostracoidea.