nəˈtästrəkə noun plural
Usage: capitalized
Etymology: New Latin, from not- (I) + -ostraca
: an order of small freshwater crustaceans (subclass Branchiopoda) having a shield-shaped carapace, sessile paired eyes, vestigial antennae, and 40 to 63 pairs of trunk appendages — see triops
• no·tos·tra·can -kən adjective or noun