单词 | umbo |
释义 | um·bo ![]() n. pl. um·bo·nes (ŭm-bōnēz) or um·bos 1. The boss or knob at the center of a shield. 2. a. Biology A knoblike protuberance arising from a surface, as the prominence near the hinge of a bivalve shell or the raised area in the center of the cap of a mushroom. b. Anatomy A small projection at the center of the outer surface of the eardrum. [Latin umbō, umbōn-; see nobh- in the Appendix of Indo-European roots.] umbo·nal (ŭmbə-nəl, ŭm-bōnəl) adj. |
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