saddle-joint

saddle joint

noun Masonry.
(on a sill, coping, or the like) a vertical joint raised above the level of the washes on each side.

Origin:
1870–75

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

saddle joint n.
A biaxial joint in which the double motion is effected by the opposition of two surfaces, each of which is concave in one direction and convex in the other, as in the carpometacarpal articulation of the thumb.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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