Pen*nat"u*la (?), n.; pl. L. Pennatulae (#), E. Pennatulas (#). [NL., fr. L. penna a feather.] Zool.
Any one of numerous species of Pennatula, Pteroides, and allied genera of Alcyonaria, having a featherlike form; a sea-pen. The zooids are situated along one edge of the side branches.
© Webster 1913.