反射弧

reflex arc

contrary / in reverse / inside out or upside down / to reverse / to return / to oppose / opposite / against / anti- / to rebel / to use analogy / instead / abbr. for 反切[fan3 qie4] phonetic system

to reflect / reflection (from a mirror etc) / reflex (i.e. automatic reaction of organism)

old variant of 射[she4]

to shoot / to launch / to allude to / radio- (chemistry)

arc