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Comprehensive
Dictionary Suite
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uprise to appear, esp. from below the horizon; rise. [1/6 definitions]
vertical perpendicular to level ground; extending at right angles to the horizon; upright. [1/4 definitions]
vertical circle an imaginary circle on the celestial sphere that passes through the zenith and nadir and is thus perpendicular to the horizon.
whiteout a weather condition, usu. occurring in polar areas, in which the snow-covered ground blends into a white sky, blotting out the horizon and destroying the sense of depth, direction, and distance.