Umbilical cord
.
(a) (Anat.) The cord which connects the fetus with the placenta, and contains the
arteries and the vein through which blood circulates between the fetus and the placenta; the navel-string.
(b) (Bot.) The little stem by which the seeds are attached to the placenta; — called also funicular cord.
— Umbilical hernia (Med.), hernia of the bowels at the umbilicus. — Umbilical point (Geom.),
an umbilicus. See Umbilicus, 5. — Umbilical region (Anat.), the middle region of the abdomen,
bounded above by the epigastric region, below by the hypogastric region, and on the sides by the lumbar
regions. — Umbilical vesicle (Anat.), a saccular appendage of the developing embryo, containing the
nutritive and unsegmented part of the ovum; the yolk sac. See Illust. in Appendix.
Umbilicate
(Um*bil"i*cate Um*bil"i*ca`ted) a. [L. umbilicatus. See Umbilic.] (a) Depressed in the
middle, like a navel, as a flower, fruit, or leaf; navel-shaped; having an umbilicus; as, an umbilicated smallpox
vesicle. (b) (Bot.) Supported by a stalk at the central point.
Umbilication
(Um*bil"i*ca"tion) n. A slight, navel-like depression, or dimpling, of the center of a rounded
body; as, the umbilication of a smallpox vesicle; also, the condition of being umbilicated.
Umbilicus
(||Um`bi*li"cus) n. [L. See Umbilic.]
1. (Anat.) The depression, or mark, in the median line of the abdomen, which indicates the point where
the umbilical cord separated from the fetus; the navel.
2. (Gr. & Rom. Antiq.) An ornamented or painted ball or boss fastened at each end of the stick on
which manuscripts were rolled. Dr. W. Smith.
3. (Bot.) The hilum.
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.
Umble pie
(Um"ble pie`) A pie made of umbles. See To eat humble pie, under Humble.
Umbles
(Um"bles) n. pl. [See Nombles.] The entrails and coarser parts of a deer; hence, sometimes,
entrails, in general. [Written also humbles.] Johnson.
Umbo
(||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.
Umbonate
(Um"bo*nate Um"bo*na`ted) a. [NL. umbonatus. See Umbo.] Having a conical or rounded
projection or protuberance, like a boss.
Umbra
(||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.