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reflex re·flex (rē'flěks')
An involuntary physiological response to a stimulus.
An unlearned or instinctive response to a stimulus.
Something, such as light or heat, that is reflected.
Being an involuntary action or response, such as a sneeze, blink, or hiccup.
Bent, turned, or thrown back; reflected.
To cause to undergo a reflex process.
An action or movement not controlled by conscious thought. A reflex may be anything from a hiccup to the involuntary response of a body part, such as the action that occurs in the knee-jerk reflex.