asymptote(redirected from Asymptot)
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a straight line that is closely approached by a plane curve so that the perpendicular distance between them decreases to zero as the distance from the origin increases to infinity
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A line approached by a curve in the limit as the curve approaches infinity.
The limit of the tangents to a curve as the point of contact approaches infinity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.