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It is a special case of metamerism; thus, the lactam and the lactim compounds exhibit tautomerism.

An extensive division of fishes including the ordinary fishes (Teleostei) and the ganoids.

A slender knife for use in the operation of tenotomy.

The division of a tendon, or the act of dividing a tendon.

A tumor, sometimes found in newborn children, which is made up of a heterigenous mixture of tissues, as of bone, cartilage and muscle.

Having a division by fours; separated into four parts or series, or into series of fours.

Consisting of four atoms; having four atoms in the molecule, as phosphorus and arsenic.

Zoötomy.

The operation of opening the pleural cavity by incision.

The operation of cutting into the thyroid cartilage.

An apparatus for the determination of colors by comparison with arbitrary standards; a colorimeter.

An instrument for removing the tonsils.

The operation of removing the tonsil, or a portion thereof.

and then browned in an oven, -- used as food for infants. 'T is said that her top-and-bottoms were gilt. Hood.

The operation of making an opening into the windpipe.

An order of tailed aquatic amphibians, including Siren and Pseudobranchus. They have anterior legs only, are eel-like in form, and have no teeth except a small patch on the palate. The external gills are persistent through life.

Having three atoms; -- said of certain elements or radicals.

Divided into three parts, or into threes; three-forked; as, a trichotomous stem. Martyn.

Division into three parts.

Any one of numerous species of trematode worms belonging to Tristoma and allied genera having a large posterior sucker and two small anterior ones. They usually have broad, thin, and disklike bodies, and are parasite on the gills and skin of fishes.