pla·ni·pen·nia \ˌ ̷ ̷ ̷ ̷ˈpenēə\noun plural Usage: capitalized Etymology: New Latin, from plani- + Latin penna wing + New Latin -ia — more at pen 1.in some classifications: a suborder of Neuroptera that includes most of the typical neuropterans when Neuroptera is construed as including Megaloptera 2.in some classifications: an order or other group coextensive with Neuroptera