sea feather definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of several anthozoans with the skeleton branched into a featherlike form, as the sea pen
sea feather definition by American Heritage Dictionary
Any of several anthozoans of the family Pennatulidae, having a featherlike shape formed by an elongate shaft with paired lateral pinnules.