umbonal

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US:USA pronunciation: respellingUSA pronunciation: respelling(um′bə nl)

um•bo•nal (um′bə nl),USA pronunciation adj.

having the shape or appearance of an umbo; bosslike:an umbonal structure.
of, pertaining to, or near the umbo:the umbonal region.

Also, um•bon•ic (um bon′ik).USA pronunciation

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

um•bo (um′bō),USA pronunciation n., pl. um•bo•nes (um bō′nēz),USA pronunciation um•bos.

Heraldrya boss on a shield, as one at the center of a circular shield.
any similar boss or protuberance.
Zoologythe beak of a bivalve shell;
the protuberance of each valve above the hinge.
Anatomythe depressed area on the outer surface of the tympanic membrane.
Botanya blunt or rounded protuberance arising from a surface, as on a pine cone scale.

Latin umbō boss (of a shield), knob, projecting part; akin to umbilīcus (see umbilicus)
1715–25

Collins Concise English Dictionary © HarperCollins Publishers::

umbo /ˈʌmbəʊ/ n ( pl umbones /ʌmˈbəʊniːz/, )

a small hump projecting from the centre of the cap in certain mushrooms
a hooked prominence occurring at the apex of each half of the shell of a bivalve mollusc
a large projecting central boss on a shield, esp on a Saxon shield

Etymology: 18th Century: from Latin: boss of a shield, projecting pieceumbonate /ˈʌmbənɪt; -ˌneɪt/, umbonal /ˈʌmbən^əl/, umbonic /ʌmˈbɒnɪk/ adj

'umbonal' also found in these entries (note: many are not synonyms or translations):

umbo

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⇱ umbonal - WordReference.com Dictionary of English

umbonal