oyster agaric oys·te·ra·garic uncommon noun 1. edible agaric with a soft grayish cap growing in shelving masses on dead wood Synonymsoyster mushroomoyster fungusoyster agaricPleurotus ostreatus Related words Broader terms agaric Parts Pleurotus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
