noun

oyster

OY-ster/ˈɔɪstər/

An edible mollusk with a rough two-part shell.

An open oyster reveals its moist flesh inside a rough shell.

A closed oyster beside an oyster on the half shell, clearly showing the rough, irregular exterior and the moist edible animal inside.
Etymology

Greek ostreon already named the oyster. Its relationship to Greek words for “hard shell” and “bone” connects the shellfish’s name with its hard outer covering.

In context

America's Test Kitchen0:58
the oyster at this point and you come down and you're just scraping along the top of the shell
60-Second Video Tips: The Best Way to Shuck an Oyster

More examples

  • We order raw oysters with lemon wedges.
  • She carefully opens the oyster with a short knife.
  • The farmer raises oysters in shallow coastal waters.

Forms

oyster · oysters

Similar words

clam
A related shellfish that usually has a smoother, more symmetrical shell.
mussel
A related shellfish with a typically dark, elongated shell.