Medical Definition of free
1a: relieved from or lacking something and especially something unpleasant or burdensome <free from pain>b: not bound or confined by force <upon opening the skull a considerable amount of free blood is noted—H. G. Armstrong>
2a (1): not united with, attached to, combined with, or mixed with something else <a free surface of a bodily part> (2): having the bare axon exposed in tissue <a free nerve ending>b: not chemically combined <free calcium>c: not permanently attached but able to move about <a free electron in a metal>
3: having all living connections severed before removal to another site <a free graft> <research…in free flap transfers—B. R. Alford>
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