Relating to the collarbone and breastbone in anatomical terms; connecting the clavicle and sternum.
From Greek kleis (collarbone) plus sternon (breastbone or chest) plus -al (adjective suffix). Medical/anatomical terminology from classical Greek components.
Your collarbone and breastbone meet at a little joint that's crucial for shoulder stability—the cleidosternal joint barely moves but when it does, you notice because it can feel weird in your chest. Doctors have very specific names for every tiny joint.
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