BRACHIOPODA
Brachiopoda, phylum Brachiopoda
(noun) marine invertebrates that resemble mollusks
Source: WordNet® 3.1
Brach`i*op"o*da, n. Etym: [NL., from Gr. -poda.] (Zoöl.)
Definition: A class of Molluscoidea having a symmetrical bivalve shell,
often attached by a fleshy peduncle.
Note: Within the shell is a pair of "arms," often long and spirally
coiled, bearing rows of ciliated tentacles by which a current of
water is made to flow into the mantle cavity, bringing the
microscopic food to the mouth between the bases of the arms. The
shell is both opened and closed by special muscles. They form two
orders; Lyopoma, in which the shell is thin, and without a distinct
hinge, as in Lingula; and Arthropoma, in which the firm calcareous
shell has a regular hinge, as in Rhynchonella. See Arthropomata.
Source: Webster’s Unabridged Dictionary 1913 Edition