4. (Zoöl.) (a) A depression or opening in the center of the base of
many spiral shells. (b) Either one of the two apertures in the calamus
of a feather.
5. (Geom.) (a) One of foci of an ellipse, or other curve. [Obs.] (b) A
point of a surface at which the curvatures of the normal sections are
all equal to each other. A sphere may be osculatory to the surface in
every direction at an umbilicus. Called also umbilic.
Um"ble pie` (?). A pie made of umbles. See To eat humble pie, under
Humble.
Um"bles (?), n. pl. [See Nombles.] The entrails and coarser parts of a
deer; hence, sometimes, entrails, in general. [Written also humbles.]
Johnson.
||Um"bo (?), n.; 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 larvæ
of echinoderms or in the tympanic membrane of the ear.
3. (Zoöl.) One of the lateral prominence just above the hinge of a
bivalve shell.
{ Um"bo*nate (?), Um"bo*na`ted (?), } a. [NL. umbonatus. See Umbo.]
Having a conical or rounded projection or protuberance, like a boss.
||Um"bra (?), n.; pl. Umbræ (#). [L., a shadow.] 1. (Astron.) (a) The
||conical shadow projected from a planet or satellite, on the side
||opposite to the sun, within which a spectator could see no portion of
||the sun's disk; — used in contradistinction from penumbra. See
||Penumbra. (b) The central dark portion, or nucleus, of a sun spot.
||(c) The fainter part of a sun spot; — now more commonly called
||penumbra.
||
2. (Zoöl.) Any one of several species of sciænoid food fishes of the
genus Umbrina, especially the Mediterranean species (U. cirrhosa),
which is highly esteemed as a market fish; — called also ombre, and
umbrine.
Umbra tree (Bot.), a tree (Phytolacca diocia) of the same genus as
pokeweed. It is native of South America, but is now grown in southern
Europe. It has large dark leaves, and a somber aspect. The juice of its
berries is used for coloring wine. J. Smith (Dict. Econ. Plants).
Um*brac`u*lif"er*ous (?), a. [L. umbraculum umbrella (dim. of umbra
shade) + -ferous.] (Bot.) Bearing something like an open umbrella.
Um*brac`u*li*form (?), a. [L. umbraculum any thing that furnishes
shade, a bower, umbrella (dim. of umbra a shade) + -form.] Having the
form of anything that serves to shade, as a tree top, an umbrella, and
the like; specifically (Bot.), having the form of an umbrella;
umbrella- shaped.
<! p. 1562 !>
Um"brage (?; 48), n. [F. ombrage shade, suspicion, umbrage, L.
umbraticus belonging to shade, fr. umbra a shade. Cf. Umber, Umbratic.]
1. Shade; shadow; obscurity; hence, that which affords a shade, as a
screen of trees or foliage.
Where highest woods, impenetrable To star or sunlight, spread their
umbrage broad.
Milton.