achondroplasiaPronunciation: /əˌkɒndrə(ʊ)ˈpleɪzɪə, eɪ-/Definition of achondroplasia noun [mass noun] a hereditary condition in which the growth of long bones by ossification of cartilage is retarded, resulting in very short limbs and sometimes a face which is small in relation to the skull. Derivatives achondroplasic adjective achondroplasticPronunciation: /-ˈplastɪk/ adjective Origin: late 19th century: from a-1 'without' + Greek khondros 'cartilage' + plasis 'moulding' + -ia1achondroplasia in other Oxford dictionaries Definition of achondroplasia in the US English dictionary