The Collaborative International Dictionary
Synocil
Synocil \Syn"o*cil\, n. [Pref. syn- + cilium.] (Zo["o]l.) A sense organ found in certain sponges. It consists of several filaments, each of which arises from a single cell.
Wiktionary
synocil
n. (context zoology English) A sense organ found in certain sponges, consisting of several filaments, each arising from a single cell.