Saddle joint - Articulatio sellaris
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Articulation by Reciprocal Reception (articulatio sellaris; saddle-joint).—In this variety the opposing surfaces are reciprocally concavo-convex. The movements are the same as in the preceding form; that is to say, flexion, extension, adduction, abduction, and circumduction are allowed; but no axial rotation. The best example of this form is the carpometacarpal joint of the thumb.
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).
General Anatomy > Joints; Articular system > Bony joints > Synovial joint; Diarthrosis > Saddle joint