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The doctrine or theory of the gyrostat, or of the phenomena of rotating bodies.

heat of all solid elements is nearly a constant, the mean value being 6.4. -- Dynamical theory of heat, that theory of heat which assumes it to be, not a peculiar kind of matter, but a peculiar motion of the ultimate particles of matter. Heat engine, any apparatus by which a heated substance, as a heated fluid, is ma…

The ethical theory which finds the explanation and authority of duty in its tendency to give pleasure.

The practice or theory of using hellebore as a medicine.

One who believes in the theory of spontaneous generation, or heterogenesis. Bastian.

The art of curing, founded on resemblances; the theory and its practice that disease is cured (tuto, cito, et jucunde) by remedies which produce on a healthy person effects similar to the symptoms of the complaint under which the patient suffers, the remedies being usually administered in minute doses. This system was…

The theory founded on the influence which the humors were supposed to have in the production of disease; Galenism. Dunglison.

Relating to what is now called the Plutonic theory of the earth, first advanced by Dr. James Hutton. Lyell.

to the determination of the humidity of bodies, particularly of the atmosphere, with the theory and use of the instruments constructed for this purpose.

A theory which regards matter as the original principle of evil.

A tentative theory or supposition provisionally adopted to explain certain facts, and to guide in the investigation of others; hence, frequently called a working hypothesis.

Teaching the doctrine of idealism; as, the ideal theory or philosophy.

The system or theory that denies the existence of material bodies, and teaches that we have no rational grounds to believe in the reality of anything but ideas and their relations.

A theory of the origin of ideas which derives them exclusively from sensation.

a system that maintains the immateriality of the soul; idealism; esp., Bishop Berkeley's theory of idealism.

The theory or method of suggesting an effect or impression without elaboration of the details; -- a disignation of a recent fashion in painting and etching.

One who adheres to the theory or method of impressionism, so called.

ployed; a turning to good account; practical application, as of a doctrine, principle, or theory, stated in a discourse. "A good improvement of his reason." S. Clarke. I shall make some improvement of this doctrine. Tillotson.

y; a whole number, in contradistinction to a fraction or a mixed number. Complex integer (Theory of Numbers), an expression of the form a + bsq. root-1, where a and b are real integers.

In the theory of evolution: The process by which the manifold is compacted into the relatively simple and permanent. It is supposed to alternate with differentiation as an agent in development.