| 单词 |
umbonation |
| 释义 |
umboˈnation rare—1. [Cf. prec. and -ation.] A formation of the nature of an umbo.
1872H. C. Wood Fresh-w. Algæ (1874) 101 Tubercles, obtuse or sharp simple or forked spines, hair-like processes, umbonations, &c. |

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