||Pen*nat"u*la (?), n.; pl. L.
Pennatulæ (#), E. Pennatulas
(#). [NL., fr. L. penna a feather.] (Zoöl.)
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.