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
Derived Forms
Inflected Forms
Nouns
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.
See Examples For:
P. convex, even, umbo fleshy, bay, shining; g. adnate, ovate, distant; s. solid, firm, wavy, naked, colour of p.; sp.
From European Fungus Flora: Agaricaceae by Massee, George
L. prominens differs in very large umbo and permanent, free ring. mastoidea, Fr.
From European Fungus Flora: Agaricaceae by Massee, George
P. convex, umb. squamulosely punctate from the umbo, milk-white with densely crowded yellow striae; g. very broad, crowded; s. stuffed, thin, obsoletely annulate below middle. transilvanica, Schulz.
From European Fungus Flora: Agaricaceae by Massee, George
P. conico-campan. acute umbo blackish, rest reddish brown, striate; g. almost free, pale rose; s. cylindrical, almost translucent, brown, curved. carpophila, Fr.
From European Fungus Flora: Agaricaceae by Massee, George
P. 3-4 cm. white, umbo brownish, striate to middle; g. decurrent; s. equal, hollow upwards, 4-5 cm., even up to torn ring, punctate above, white; sp.
From European Fungus Flora: Agaricaceae by Massee, George
Shell oval, broad, thick; hinge margin subarcuated, the extremities winged and angulated; umbones prominent, the tips retuse.
From Zoological Illustrations, Volume III or Original Figures and Descriptions of New, Rare, or Interesting Animals by Swainson, William
On most of the valves there are furrows and ridges diverging from the umbones, and the lines of growth are plainly marked: in the valves of the lower whorl, the umbones are slightly protuberant.
From A Monograph on the Sub-class Cirripedia With Figures of all the Species. by Darwin, Charles
The umbones of the lower valves project outwards, giving a denticulated appearance to the base of the capitulum.
From A Monograph on the Sub-class Cirripedia With Figures of all the Species. by Darwin, Charles
In all four valves of Ibla, the umbones, or centres of growth, are at their upper points.
From A Monograph on the Sub-class Cirripedia With Figures of all the Species. by Darwin, Charles
The latter, in well preserved old specimens, may often be detected on the umbones of the scuta, terga, and carina, but not on the umbones of any other valves.
From A Monograph on the Sub-class Cirripedia With Figures of all the Species. by Darwin, Charles
A true terminal umbo rests on the surface of the underlying scale, although several species with terminal umbos show the first stages of the dorsal umbo.
From The Genus Pinus by Shaw, George Russell
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.
