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mply the anterior termination of the spinal cord, and is developed from three embryonic vesicles, whose cavities are connected with the central canal of the cord; the cavities of the vesicles become the central cavities, or ventricles, and the walls thicken unequally and become the three segments, the fore-, mid-, and…

A bleb; a vesicle, or an elevation of the cuticle, containing a transparent watery fluid.

A purse; also, a vesicle; a pod; a hull. [Obs.] Holland.

A contractile cell or vesicle containing liquid pigment and capable of changing its form or size, thus causing changes of color in the translucent skin of such animals as possess them. They are highly developed and numerous in the cephalopods.

. Croupous pneumonia, pneumonia attended with deposition of fibrinous matter in the air vesicles of the lungs; ordinary acute pneumonia.

A minute vesicle in a red seaweed, which contains the reproductive spores.

and intensifying sounds so as to assist the hearing of a partially deaf person. -- Ear vesicle (Zoöl.), a simple auditory organ, occurring in many worms, mollusks, etc. It consists of a small sac containing a fluid and one or more solid concretions or otocysts. -- Rose ear (in dogs), an ear which folds backward and s…

of the skin, characterized by the presence of redness and itching, an eruption of small vesicles, and the discharge of a watery exudation, which often dries up, leaving the skin covered with crusts; -- called also tetter, milk crust, and salt rheum.

Of or pertaining to an embryo; embryonal; rudimentary. Embryonic sac or vesicle (Bot.), the vesicle within which the embryo is developed in the ovule; -- sometimes called also amnios sac, and embryonal sac.

In a lump; as a whole; all together. "Movement of the ossicles en bloc." Nature.

Inclosed in a cyst, or a sac, bladder, or vesicle; as, an encysted tumor. The encysted venom, or poison bag, beneath the adder's fang. Coleridge.

re preceded by chills. It is of malarial origin. -- Fever blister (Med.), a blister or vesicle often found about the mouth in febrile states; a variety of herpes. -- Fever bush (Bot.), the wild allspice or spice bush. See Spicewood. -- Fever powder. Same as Jame's powder. -- Fever root (Bot.), an American herb of t…

of a fish, consisting of a membrane supported by rays, or little bony or cartilaginous ossicles, and serving to balance and propel it in the water.

Pertaining or belonging to a germ; as, the germinal vesicle. Germinal layers (Biol.), the two layers of cells, the ectoblast and entoblast, which form respectively the outer covering and inner wall of the gastrula. A third layer of cells, the mesoblast, which is formed later and lies between these two, is sometimes inc…

ertaining to germination; having power to bud or develop. Germinative spot, Germinative vesicle. (Biol.) Same as Germinal spot, Germinal vesicle, under Germinal.

aining to, or discovered by, Regnier de Graaf, a Dutch physician. Graafian follicles or vesicles, small cavities in which the ova are developed in the ovaries of mammals, and by the bursting of which they are discharged.

various names, according to its form, or the part affected; especially, an eruption of vesicles in small distinct clusters, accompanied with itching or tingling, including shingles, ringworm, and the like; -- so called from its tendency to creep or spread from one part of the skin to another.

A plant (Mesembryanthemum crystallinum), sprinkled with pellucid, watery vesicles, which glisten like ice. It is native along the Mediterranean, in the Canaries, and in South Africa. Its juice is said to be demulcent and diuretic; its ashes are used in Spain in making glass. Ice-skater = one who skates on ice wearing a…

An eruption of small, isolated, acuminated vesicles, produced by the entrance of a parasitic mite (the Sarcoptes scabei), and attended with itching. It is transmissible by contact.

m animals, characterized by the formation, at the point of reception of the virus, of a vesicle or pustule which first enlarges and then breaks down into an unhealthy ulcer. It is marked by profound exhaustion and usually fatal. Called also charbon, and sometimes, improperly, anthrax.