ostreaceous
/ˌɒstrɪˈeɪʃəs/rare
adjective
Of the nature of an oyster or oyster-shell; resembling or characteristic of an oyster; oyster-like.
Origin
Late 17th century; earliest use found in Ralph Cudworth (1617–1688), philosopher and theologian. From classical Latin ostrea oyster + -aceous, after crustaceous. Compare ostraceous.