The Collaborative International Dictionary
Phyllobranchia
Phyllobranchia \Phyl`lo*bran"chi*a\, n.; pl. Phyllobranci[ae]. [NL. See Phyllo-, and Branchia.] (Zo["o]l.) A crustacean gill composed of lamell[ae].
Wiktionary
phyllobranchia
n. (context zoology English) A crustacean gill composed of lamellae.