double tangent

double tangent

[¦dəb·əl ′tan·jənt]
(mathematics)
A line which is tangent to a curve at two distinct noncoincident points. Also known as bitangent.
Two coincident tangents to branches of a curve at a given point, such as the tangents to a cusp.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The "Line of Beauty" - a double tangent - is exemplified by furniture legs, the stockinged legs of dancing masters, the handles of teapots, the figure implied by outer garments, and the way men bow and women curtsy.