Webster
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Webster’s Revised Unabridged Dictionary · 1913

Horizontal

Hor′i·zon′tal (hŏr′ĭ·zŏn′tal), a. [Cf. F. horizontal.] 1. Pertaining to, or near, the horizon. "Horizontal misty air." Milton.

2. Parallel to the horizon; on a level; as, a horizontalline or surface.

3. Measured or contained in a plane of the horizon; as, horizontal distance.

Horizontal drill, a drilling machine having a horizontal drill spindle. — Horizontal engine, one the piston of which works horizontally. — Horizontal fire (Mil.), the fire of ordnance and small arms at point-blank range or at low angles of elevation. — Horizontal force (Physics), the horizontal component of the earth's magnetic force. — Horizontal line (Descriptive Geometry & Drawing), a constructive line, either drawn or imagined, which passes through the point of sight, and is the chief line in the projection upon which all verticals are fixed, and upon which all vanishing points are found. — Horizontal parallax. See under Parallax. — Horizontal plane (Descriptive Geometry), a plane parallel to the horizon, upon which it is assumed that objects are projected. See Projection. It is upon the horizontal plane that the ground plan of the buildings is supposed to be drawn. — Horizontal projection, a projection made on a plane parallel to the horizon. — Horizontal range (Gunnery), the distance in a horizontal plane to which a gun will throw a projectile. — Horizontal water wheel, a water wheel in which the axis is vertical, the buckets or floats revolving in a horizontal plane, as in most turbines.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty. Of the others, 1,362 (a word or a single letter each) were inferred by AI from the context by the dictionary’s own rules and are marked with a wavy underline (tap or point at one to see the note); the rest, which could not be inferred with confidence, are left as “?”.