Entry 1 sense Webster, 1913 Alcyonaria /(acr/l`sĭ*ŏ*nā"rĭ*ȧ)/ · Al·cy·o·na·ri·a · IPA 01 prop. n. pl. One of the orders of Anthozoa. It includes the Alcyonacea, Pennatulacea, and Gorgonacea. 1. One of the orders of Anthozoa. It includes the Alcyonacea, Pennatulacea, and Gorgonacea.(Zool.)