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Webster 1913 Edition
Umbo
‖
Um′bo
,Noun.
pl. L.
Umbones
(#)
, E. Umbos
(#)
. [L.]
1.
The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.
2.
A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane;
as, the
. umbo
in the integument of the larvae of echinoderms or in the tympanic membrane of the ear3.
(Zool.)
One of the lateral prominences just above the hinge of a bivalve shell.
Webster 1828 Edition
Umbo
UM'BO
,Noun.