• synonyms


  1. having the shape or appearance of an umbo; bosslike: an umbonal structure.
  2. of, relating to, or near the umbo: the umbonal region.
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Also um·bon·ic [uhm-bon-ik] /ʌmˈbɒn ɪk/.

Origin of umbonal

1850–55; < Latin umbōn- (stem of umbō; see umbo) + -al1
Related formspost·um·bo·nal, adjectivepre·um·bo·nal, adjectivesub·um·bo·nal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for umbonal

Historical Examples

  • 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.