single oystern.(a) ‘an oyster which becomes detached from the bunches after two years' growth; hence, a grown or merchantable oyster’ (Cent. Dict.); (b) see quot.
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1881 E. IngersollOyster-industry (10th Census U.S.: Bureau of Fisheries) 248Single Oysters.—In the south ‘single oyster’ means an edible oyster in contradistinction from the raccoon oyster.