thīˈrästrəkə noun plural
Usage: capitalized
Etymology: New Latin, from thyro- (from Greek thyra door, opening) + Greek ostraka, plural of ostrakon shell — more at door , oyster
in some especially former classifications : a subclass of Crustacea coextensive with Cirripedia
• thy·ros·tra·can (ˈ) ̷ ̷| ̷ ̷ ̷ ̷kən adjective or noun