cotyloid joint co·ty·loid·joint uncommon noun 1. a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone Synonymsball-and-socket jointspheroid jointcotyloid jointenarthrodial jointenarthrosisarticulatio spheroidea Related words Broader terms synovial joint Narrower terms shoulderhip WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
