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Medical Definition of Clinoid process
1. One of three pairs of bony projections from the sphenoid bone: anterior clinoid process, the recurved posterior angle of the lesser wing; middle clinoid process, a little spur of bone on the body of the sphenoid, posterolateral to the tuberculum sellae; posterior clinoid process, a spur of bone at each superior angle of the dorsum sellae. Synonym: processus clinoideus, clinoid. (05 Mar 2000)