n.
Pronunciation: ˌ f ō -t ō -( ˌ )b ī - ' ä-l ə -j ē
Function: noun
Etymology: International Scientific Vocabulary
Date: 1935
: a branch of biology that deals with the effects on living organisms of radiant energy (as light)
– pho · to · bi · o · log · i · cal \ - ˌ b ī - ə - ' lä-ji-k ə l \ also pho · to · bi · o · log · ic \ - ' lä-jik \ adjective
– pho · to · bi · ol · o · gist \ -( ˌ )b ī - ' ä-l ə -jist \ noun