ˈoysterous,a. [f. oyster n. + -ous.] Of the nature of, or full of, oysters. 1836T. Hook G. Gurney III. 239 The conversation..of those oysterous, boisterous convivialists.1882H. C. Merivale Faucit of Ball. II. ii. iv. 192 A little pair of oysterous eyes of no particular colour.