Umbo meaning

ŭm'bō
The boss or knob at the center of a shield.
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The boss, or knob, at the center of a shield.
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Something resembling this.
  • The elevation beside the hinge on each half of a bivalve shell.
  • The prominence on the eardrum at the point of attachment of the malleus.
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A small anatomical projection on a surface, such as that on the inner surface of the eardrum at the end of the manubrium of the malleus, corresponding to the most elevated point of the eardrum.
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(biology) A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane; as, the umbo in the integument of the larvæ of echinoderms or in the tympanic membrane of the ear.
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(zoology) One of the lateral prominence just above the hinge of a bivalve shell.
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(mycology) A bump or protrusion on the top of the cap.
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(historical) The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.
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Origin of umbo

  • Latin umbō umbōn- nobh- in Indo-European roots
    From American Heritage Dictionary of the English Language, 5th Edition
  • Borrowed from Latin umbo
    From Wiktionary

Umbo Sentence Examples

  • Umbo of ventral valve.

  • They protected themselves in battle with a large wooden or wicker shield, the centre of which was ornamented with an iron boss (umbo).

  • The ventral valve is usually the larger, and in many genera, such as Terebratula and Rhynchonella, has a prominent beak or umbo, with a circular or otherwise shaped foramen at or near its extremity, partly bounded by one or two plates, termed a deltidium.

  • A considerable length of the toga was allowed to hang from the left shoulder; the remainder was passed round the body so as to rise like a baldric (balteus) from the right hip to the left shoulder, being folded over in front (the fold was called sinus), then brought round the back of the neck so that the end fell over the right shoulder; the hanging portion on the left side was drawn up through the sinus, and bulged out in an umbo (Plate, fig.

  • The beak or umbo of each valve is prominent and rounded, and a number of sharp ridges and furrows radiate from the apex to the free edge of the shell, which is crenated.

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Also Mentioned In

Words near umbo in the Dictionary