Webster's English Dictionary

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photosynthesis

pho.to.syn.the.sis \.fo-t-*-'sin(t)-th*-s*s\ \-.si-z\ \-(.)sin-'thet-ik\ 
   \-i-k(*-)le-\ n [NL] : synthesis of chemical compounds with the aid of 
   radiant energy and esp.  light; esp : formation of carbohydrates in the 
   chlorophyll-containing tissues of plants exposed to light - 
   pho.to.syn.the.size vi