Webster's English Dictionary

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autotrophic

au.to.tro.phic \.o.t-*-'tra:f-ik, -'tro--fik\ \-i-k(*-)le-, -fi-\ aj [prob. 
   fr. G autotroph, fr. Gk autotrophos supplying one's own food], fr. aut- + 
   trephein to nourish - more at ATROPHY 1: needing only carbon dioxide or 
   carbonates as a source of carbon and a simple inorganic nitrogen compound 
   for metabolic synthesis 2: not requiring a specified exogenous factor for 
   normal metabolism  - au.to.tro.phi.cal.ly av