umbo
Americannoun
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a boss on a shield, as one at the center of a circular shield.
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any similar boss or protuberance.
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Zoology. the beak of a bivalve shell; the protuberance of each valve above the hinge.
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Anatomy. the depressed area on the outer surface of the tympanic membrane.
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a blunt or rounded protuberance arising from a surface, as on a pine cone scale.
noun
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a small hump projecting from the centre of the cap in certain mushrooms
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a hooked prominence occurring at the apex of each half of the shell of a bivalve mollusc
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anatomy the slightly convex area at the centre of the outer surface of the eardrum, where the malleus is attached on the internal surface
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a large projecting central boss on a shield, esp on a Saxon shield
Other Word Forms
Etymology
Origin of umbo
1715–25; < Latin umbō boss (of a shield), knob, projecting part; akin to umbilīcus ( see umbilicus)
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
S. 2-3 cm. long, wavy, peronate with white veil, cingulate, umbo blackish. punctatus, Fr.
From European Fungus Flora: Agaricaceae by Massee, George
P. 5-7 cm. convex then exp. depressed round the umbo, blackish umber, even, glabrous; g. reddish cinnamon; s. 4-6 cm. hollow, somewhat twisted, fibrillose, greyish fuscous; sp. subgl. rough, 8 � 9.
From European Fungus Flora: Agaricaceae by Massee, George
P. convex, subdepr. with a slight umbo, whitish yellow; g. crowded, pale cinnamon; s. reddish. macilenta, Fr.
From European Fungus Flora: Agaricaceae by Massee, George
P. 4-6 cm., umbo very strong, ochraceous, scaly; g. white; s. 9-15 cm. slender, base swollen, ring free; sp.
From European Fungus Flora: Agaricaceae by Massee, George
The hand was protected by a hollow conical boss or umbo, fixed to the wood by its brim, but projecting considerably.
From Beowulf An Introduction to the Study of the Poem with a Discussion of the Stories of Offa and Finn by Chambers, R. W.
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
