achondroplasty ac·hond·rop·lasty uncommon noun 1. an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism Synonymsachondroplasiaosteosclerosis congenitachondrodystrophy Related words Broader terms genetic disease WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.