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A description of, or treatise on, organic tissues.

Pertaining to histology, or to the microscopic structure of the tissues of living organisms. -- His`to*log"ic*al*ly, adv.

The decay and dissolution of the organic tissues and of the blood.

The science which treats of the laws relating to organic tissues, their formation, development, functions, etc.

The dissection of organic tissues.

ly vegetable. Holophytic nutrition (, that form of nutrition, characteristic of vegetable organisms, in which carbonic acid, ammonia, and nitrates are absorbed as food, in distinction from the animal mode of nutrition, by the ingestion of albuminous matter.

Relating to that kind of homology or symmetry, the mathematical conception of organic form, in which all axes are equal. See under Promorphology.

Belonging to the same category of individuality; -- a morphological term applied to organisms so related.

A morphological term signifying development, in the case of multicellular organisms, from the same unit deme or unit of the inferior orders of individuality.

m of a man, the fore leg of a horse, the wing of a bird, and the fin of a fish, all these organs being modifications of one type of structure.

semblance between different plants or animals, in external shape, in general habit, or in organs, which is not due to descent from a common ancestor, but to similar surrounding circumstances.

In promorphology, pertaining to or exhibiting that kind of organic form, in which the stereometric ground form is a pyramid, with similar poles. See Promorphology.

Developing, in the case of multicellular organisms, from the same embryonic systems into which the secondary unit (gastrula or plant enbryo) differentiates.

See Army organization, above.

A chemical substance formed in one organ and carried in the circulation to another organ on which it exerts a stimulating effect; thus, according to Starling, the gastric glands are stimulated by a hormone from the pyloric mucous membrane.

A hard, projecting, and usually pointed organ, growing upon the heads of certain animals, esp. of the ruminants, as cattle, goats, and the like. The hollow horns of the Ox family consist externally of true horn, and are never shed.

One of a series of artificial, organic bases, usually produced as thick viscous liquids by the action of ammonia on ethylene oxide. They have the properties both of alcohol and amines.

An ancient musical instrument played by the action of water; a water organ. [Written also hydraulis.]

rm, also used adjectively, indicating hydroxyl as an ingredient. Hydroxy acid (Chem.), an organic acid, having (besides the hydroxyl group of the carboxyl radical) an alcoholic hydroxyl group, and thus having the qualities of an alcohol in addition to its acid properties; as, lactic and tartaric acids are hydroxy acids…

A nitrogenous, organic base, NH2.OH, resembling ammonia, and produced by a modified reduction of nitric acid. It is usually obtained as a volatile, unstable solution in water. It acts as a strong reducing agent.