Webster's English Dictionary

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photosensitive

pho.to.sen.si.tive \-'sen(t)-s*t-iv, -'sen(t)-stiv\ 
   \-.sen(t)-s*-'tiv-*t-e-\ aj : sensitive or sensitized to the action of 
   radiant energy  - pho.to.sen.si.tiv.i.ty n