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a. Any of several edible bivalve mollusks of the family Ostreidae, having a rough, irregularly shaped shell attached to the substrate in shallow marine waters. Oysters are widely cultivated for food.
b. Any of various similar or related bivalve mollusks, such as the pearl oyster.
2. An edible bit of muscle found in the hollow of the pelvic bone of a fowl.
a. A special delicacy.
b. Something from which benefits may be extracted.
4. Slang A close-mouthed person.
intr.v. oys·tered, oys·ter·ing, oys·ters
To gather, dredge for, or raise oysters.

[Middle English oistre, from Old French, from Latin ostreum, ostrea, from Greek ostreon; see ost- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


the activity of dredging for, gathering, or raising oysters
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in classic literature ?
"I was watching you fellows and figuring out whether we'd go oystering or not.
History of oystering in the United States and Canada, featuring the eight greatest oyster estuaries.
Oyster closures can also be ordered based on stock assessments and environmental impacts, so before you fish with oysters or go oystering check with the FWC (myfwc.com, 850-487-0554) and the FDACS (www.floridaaquaculture.com, 800-435-7352).
AoWe were oystering when nobody else was,Ao Bloom said.
Most were taken to Isla Caribe, where large shell heaps, some nearly 6 in high, laid about where shuckers had left them after many years of pearl oystering. The heaps had deep holes or trenches that had been dug by women and children who searched for pearls among the discarded shells.
The oystermen had worked out and refined their oystering procedures for over 100 y, from generation to generation.
Although originally largely a dredge bed industry, it also involved the harvesting of oysters that occur naturally in the intertidal zone, which was called "bank oystering" (Smith, 1981/82), and is referred to as "bottom culture" in NSW.
4) and other local residents, observing oystering areas and equipment, and photographing related subjects on Isla del Rey, Casaya, Bolano, and Pedro Gonzalez islands in the archipelago.