from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A small crab (Pinnotheres ostreum) that lives commensally inside the shell of a bivalve mollusk such as an oyster or a clam.

from the GNU version of the Collaborative International Dictionary of English

  • n. a small crab (Pinnotheres ostreum) which lives as a commensal in the gill cavity of the oyster.

from The Century Dictionary and Cyclopedia

  • n. One of the little crabs which live with oysters in the shells of the latter; a pea-crab. The kind which lives in the common oyster is a grapsoid crustacean, Pinnotheres ostreum. See Pinnotheres.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. tiny soft-bodied crab living within the mantle cavity of oysters


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