noun
elbow joint
Anatomical term referring to the joint connecting the upper arm and forearm.
テニス肘は肘関節の外側に痛みが出る。
Tennis elbow causes pain on the outside of the elbow joint.
Common word for 'elbow'; 肘関節 is the specific anatomical term for the joint.
Compound of 肘 (hiji, 'elbow') and 関節 (kansetsu, 'joint'). The reading ちゅうかんせつ uses the on'yomi of 肘.