- having the shape or appearance of an umbo; bosslike: an umbonal structure.
- of, relating to, or near the umbo: the umbonal region.
Also um·bon·ic [uhm-bon-ik] /ʌmˈbɒn ɪk/.
Origin of umbonal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for umbonal
Historical Examples of umbonal
Its shell is considerably twisted just below the umbonal region, while its whole surface is densely striated.The Sea-beach at Ebb-tide
Augusta Foote Arnold
Ligament wanting; shell gaping, with a styloid apophysis in the umbonal cavities.