Re·flex a.
 1. Directed back; attended by reflection; retroactive; introspective.
    The reflex act of the soul, or the turning of the intellectual eye inward upon its own actions.   --Sir M. Hale.
 2. Produced in reaction, in resistance, or in return.
 3. Physiol. Of, pertaining to, or produced by, stimulus or excitation without the necessary intervention of consciousness.
 Reflex action Physiol., any action performed involuntarily in consequence of an impulse or impression transmitted along afferent nerves to a nerve center, from which it is reflected to an efferent nerve, and so calls into action certain muscles, organs, or cells.
 Reflex nerve Physiol., an excito-motory nerve. See Exito-motory.