Clavicle - clavis, key or fastener. An ancient window fastener was a stick with a double curve.⏎
Cerebellum - cerebellum, little brain.⏎
Azygos - azygos, unyoked (not a pair) named for its asymmetry.⏎
Atlas - Atlas, mythical figure; Atlas supports the world on his shoulders.⏎
Cerebrum - cerebrum, brain.⏎