having the shape or appearance of an umbo; bosslike: an umbonal structure.
of, pertaining to, or near the umbo: the umbonal region.
Also, umbonic [uhm-bon-ik] .

1850–55; < Latin umbōn- (stem of umbō; see umbo) + -al1

postumbonal, adjective
preumbonal, adjective
subumbonal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
umbo (ˈʌmbəʊ)
n , pl umbones, umbos
1.  a small hump projecting from the centre of the cap in certain mushrooms
2.  a hooked prominence occurring at the apex of each half of the shell of a bivalve mollusc
3.  anatomy the slightly convex area at the centre of the outer surface of the eardrum, where the malleus is attached on the internal surface
4.  a large projecting central boss on a shield, esp on a Saxon shield
[C18: from Latin: boss of a shield, projecting piece]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The relationship is apparent on comparing them with the umbonal region of a well preserved adult specimen.
The other is remarkable for an extremely prominent umbonal ridge.
Dark brown coloration may appear in the umbonal region and the remaining surface may exhibit alternating light and dark bands.
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