<p><strong>Noun</strong></p><ul><li>any sessile marine chordate of the subphylum Tunicata (Urochordata)</li><li>having a saclike body enclosed in a thick membrane or tunic</li><li>two openings or siphons for the ingress and egress of water</li></ul><p><strong>Adjective</strong></p><ul><li>having a tunic or covering</li><li>of or relating to the tunicates</li><li>having or consisting of a series of concentric layers, as a bulb</li></ul>