Eversion

Eversion may refer to:
 * Eversion (kinesiology), the anatomical term of motion denoting the movement of the sole of the foot away from the median plane
 * Eversion (mathematics), the process of turning a shape inside out without causing creases; in particular, sphere eversion.
 * In sea cucumbers, a form of autotomy in which the animal ejects its internal organs as a defensive strategy, effectively turning itself inside out.