epipodite

from The Century Dictionary.

• noun A third branch of the limb of a crustacean, as distinguished from both the endopodite and the exopodite; a segment of the typical limb, actually developed in some of the limbs in relation with the branchiæ, and articulated with the protopodite or coxopodite. Also called flabellum. See cut under endopodite.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) The outer branch of the legs in certain Crustacea. See maxilliped.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun zoology The outer branch of the legs in certain crustaceans.