ostraceous

Adjective

ostraceous (comparative more ostraceous, superlative most ostraceous)

1. Resembling or characteristic of an oyster.
   • That in the smaller jar is of the least consequence, being a mere unconnected formless fragment of a brown colour; while the other (which is figured) as grown over the concavity of a small ostraceous bivalve shell (fig. 26, b), and is of a lighter colour, but at once reveals the structure and...1874, The Annals and Magazine of Natural History - Volume 14, page 245
   • The Yoma range, according to the geological note in William's map of Pegu, is composed of brown or grey slate clay, with thin layers of bituminous limestone, containing fossil ostraceous remains, frequently alternating with, and entering into, beds of argillaceous sandstone, generally soft and...1876, Alexander Ruxton McMahon, The Karens of the Golden Chersonese, page 209