ˌ ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷ˈ ̷ ̷ēˌī noun plural
Usage: capitalized
Etymology: New Latin, from actin- + -pterygii (from Greek pteryg-, pteryx wing); akin to Greek pteron feather, wing — more at feather
in many classifications : a subclass or other division of Teleostomi comprising fishes having the projecting part of the paired fins supported only by dermal rays and being coextensive with the Teleostomi excluding the Choanichthyes
• ac·ti·nop·te·ryg·i·ous | ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷| ̷ ̷ēəs adjective