Of or relating to a reflexive response of one body structure following stimulation of another, such as the concurrent constriction of one pupil in response to light shined in the other.

• 同感的一部分身体结构因另一部分受到刺激而产生本能反应的或与这种同感本能反应相关的，如当光线射在一个瞳孔上另一个瞳孔会同时收缩