- 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
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.