“deltidium”的英英意思

单词 deltidium 释义 ‖ deltidium Conch.|dltdm|[mod.L. dim. of Gr. delta, in reference to its shape. (Cf. Gr. little dog, from -.)]The triangular space, usually covered in by a horny shell or operculum, between the beak and the hinge of brachiopod shell...