| 释义 |
umˈbonial, a. rare—1.
[Cf. umbonal a.]
Of or belonging to the umbo of a shell.
1824Q. Jrnl. Sci. XVII. 16 Four series of short oblique grooves, or of indented wrinkles, three of which are arranged in a direction with the umbonial slope.
So umˈbonic a.
1877Huxley Anat. Inv. Anim. viii. 473 Sometimes the umbonic cone is prolonged and bent inwards. |