ORTHOGONIAL

, in Geometry, is the same as rectangular, or right-angled.—When the term refers to a plane figure, it supposes one leg or side to stand perpendicular to the other: when spoken of solids, it supposes their axis to be perpendicular to the plane of the horizon.

ORTHOGRAPHIC or Orthographical Projection of the Sphere, is the projection of its surface or of the sphere on a plane, passing through the middle of it, by an eye vertically at an infinite distance. See PROJECTION.

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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.

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ORLE
ORRERY
ORTEIL
ORTELIUS (Abraham)
ORTHODROMICS
* ORTHOGONIAL
ORTHOGRAPHY
ORTIVE
OSCILLATION
OSCULATION
OTACOUSTIC