American Heritage® Dictionary of the English Language, Fourth Edition
- n. A small crab (Pinnotheres ostreum) that lives commensally inside the shell of a bivalve mollusk such as an oyster or a clam.
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.
GNU Webster's 1913
- n. (Zoöl.) a small crab (Pinnotheres ostreum) which lives as a commensal in the gill cavity of the oyster.
- n. tiny soft-bodied crab living within the mantle cavity of oysters
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