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ef ganglia of the nervous system, the mouth, and in the higher animals, the chief sensory organs; poll; cephalon.

A hollow, muscular organ, which, by contracting rhythmically, keeps up the circulation of the blood. Why does my blood thus muster to my heart! Shak.

A neutral organic substance found in the root of the elecampane (Inula helenium), and extracted as a white crystalline or oily material, with a slightly bitter taste.

Any substance, such as an iron salt or organic compound containing iron, which when ingested tends to increase the hemoglobin contents of the blood.

Having half as many (three) carboxyl radicals as mellitic acid; -- said of an organic acid.

two sexes in the same individual, or the combination of some of their characteristics or organs in one individual.

A protrusion, consisting of an organ or part which has escaped from its natural cavity, and projects through some natural or accidental opening in the walls of the latter; as, hernia of the brain, of the lung, or of the bowels. Hernia of the abdominal viscera in most common. Called also rupture. Strangulated hernia, a…

In evolution, a deviation from the typical sequence in the formation of organs or parts.

od of reproduction in which the successive generations differ from each other, the parent organism producing offspring different in habit and structure from itself, the original form, however, reappearing after one or more generations; -- opposed to homogenesis, or gamogenesis.

elements in different proportions; different; -- opposed to homologous; as, heterologous organs. Heterologous stimulus. (Physiol.) See under Stimulus. -- Heterologous tumor (Med.), a tumor differing in structure from the normal tissues of the body.

Producing a different type of organism; developing into a different form of tissue, as cartilage which develops into bone. Haeckel.

m; heterogenous arrangement or structure, as, in botany, the deviation in position of the organs of a plant, from the ordinary or typical arrangement.

A deviation from the natural position; -- a term applied in the case of organs or growths which are abnormal in situation.

The science which treats of the complex relations of living creatures to other organisms, and to their surrounding conditions generally. St. George Mivart.

A body of officials disposed organically in ranks and orders each subordinate to the one above it; a body of ecclesiastical rulers.

Of lofty structure; tall. "High-built organs." Tennyson. The high-built elephant his castle rears. Creech.

The part of a gland, or similar organ, where the blood vessels and nerves enter; the hilus; as, the hilum of the kidney.

The formation and development of organic tissues; histogeny; -- the opposite of histolysis.

Tissue-producing; connected with the formation and development of the organic tissues.

One who describes organic tissues; an histologist.