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Heavy or dull in respect to motion or thought; as, a logy horse. [U.S.] Porcupines are . . . logy, sluggish creatures. C. H. Merriam.

Materia medica; the science of remedies.

The science which treats of rays of light, especially of the actinic or chemical rays.

The part of physiology that treats of the glands.

The science of aërolites.

That department of physics which treats of the atmosphere.

The science of sensation in relation to nervous action. H. Spenser.

The science, doctrine, or demonstration of causes; esp., the investigation of the causes of any disease; the science of the origin and development of things.

The doctrine concerning those things of which we are necessarily ignorant.

Description or comparative study of the customs of savage or uncivilized tribes.

That part of botany which treats of the grasses.

See Ætiology.

The science which treats of the nature of truth and evidence. Sir W. Hamilton.

The study or science of algæ or seaweeds.

Unreasonableness; absurdity. [Obs.]

A treatise on amphibious animals; the department of natural history which treats of the Amphibia.

A phrase, discourse, or proposition, susceptible of two interpretations; and hence, of uncertain meaning. It differs from equivocation, which arises from the twofold sense of a single term.

Ambiguity of speech; equivocation. [R.]

A resemblance of relations; an agreement or likeness between things in some circumstances or effects, when the things are otherwise entirely different. Thus, learning enlightens the mind, because it is to the mind what light is to the eye, enabling it to discover things before hidden.

The science of the wind.