音标：['ɔstriə] ；

n. [古生物]牡蛎属

n. A genus of bivalve Mollusca which includes the true
oysters.

词型变化：名词复数形式 : ostreas

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agrihan i.

alkali feldspar

analog-digital hybrid computer

anodium

ardure

armoured seat

atmospheric gas-burner system

autem cackler

bafverstedt's ichthyosis

basis of an argument

bed velocity