The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.
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.
One of the lateral prominences just above the hinge of a bivalve shell.
the raised part at the dorsal margin of each valve, an external structure
"That point of a bivalve situated immediately above the hinge, the beak, the first formed part of a bivalve" (Arnold 1965) (Figure).
the earliest part of a bivalve or brachiopod shell; in bivalves, it is the most dorsal section of the shell, while in brachyopods, it is the most posterior
Italian, Fencing term, the swell in a surface of a shield which covers the handle behind.
Latin = the boss on the centre of a shield, umbo of tympanic membrane.
(pl. umbones) um-bo (L umbo=a knob or boss) That point of a bivalve situated immediately above the hinge. The upper (or earliest) part of a bivalve valve, as seen from the outside, the youngest, terminal portion of which is the beak, best seen in an interior view of the valve; the first part formed in a bivalve around which radial growth has proceeded.
the inflated dorsal part of the shell; also called the beak
The central protruding boss in a scutum. This was used in battle for thrusting into the faces and bodies of the enemy warriors
(umbone) In cheilostomes, a prominence on the frontal wall proximal to the orifice.
the raised area on each valve of a mussel’s shell near the hinge; also known as the beak
The anterior end of the oyster. It is pointed and the oldest part of the oyster. !-- assign table width based on how this page is called close_it();
pl. umbones. One of the prominences on either side of the hinge region in a bivalve mollusc shell. Also, the "beak" of a brachiopod shell.
(pl. umbones) The apparent "apex" or "beak" of each valve around which "radial" growth has proceeded.
A shield boss, usually in the centre of a shield, covering and protecting the hand as it holds the grip.
A knob-like limb arising from the surface of an oyster shell, near the hinge. Often refers to the anterior or hinge end of the oyster.
Shield boss that covers the hand as it holds the grip
The anterior end of the oyster. It is pointed and the oldest part of the oyster. close window
a mound-shaped sub-orifical projection of frontal wall calcification.
The raised, knob-like section of some clam and mussel shells
Of the pileus: A raised, conical to convex knob or mound on the center. ( 17)