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of two similar parallelograms, the one within the other, with an angle in common; as, the gnomon bcdefg of the parallelograms ac and af. The parallelogram bf is the complement of the parallelogram df.

Of or pertaining to the gnomon, or the art of dialing. Gnomonic projection, a projection of the circles of the sphere, in which the point of sight is taken at the center of the sphere, and the principal plane is tangent to the surface of the sphere. "The gnomonic projection derives its name from the connection between…

According to the principles of the gnomonic projection.

ience of dialing, or of constructing dials to show the hour of the day by the shadow of a gnomon.

One skilled in gnomonics. Boyle.

A treatise on gnomonics.

r decisively characteristic of a disease; indicating with certainty a disease; as, a pathognomonic symptom. The true pathognomonic sign of love jealousy. Arbuthnot.

The style of gnomon of a dial. Chambers.

ference between that arc or angle and 90º. -- Complement of a parallelogram. (Math.) See Gnomon. -- In her complement (Her.), said of the moon when represented as full.

instrument, formerly much used for showing the time of day from the shadow of a style or gnomon on a graduated arc or surface; esp., a sundial; but there are lunar and astral dials. The style or gnomon is usually parallel to the earth's axis, but the dial plate may be either horizontal or vertical.

Gnomonical. Boyle.

touching the sphere, the point of sight being at the center of the sphere. -- Globular, Gnomonic, Orthographic, projection,etc. See under Globular, Gnomonic, etc. -- Mercator's projection, a mode of representing the sphere in which the meridians are drawn parallel to each other, and the parallels of latitude are str…

The pin, or gnomon, of a dial, the shadow of which indicates the hour. See Gnomon. (f) Etym: [Probably fr. Gr. (Bot.)

A right line on which the style, or gnomon, of a dial is erected; being the common section of the face of the dial and a plane perpendicular to it passing through the style. [Written also substile.] Hutton.

An instrument to show the time of day by means of the shadow of a gnomon, or style, on a plate. Sundial shell (Zoöl.), any shell of the genus Solarium. See Solarium.