Webster's English Dictionary

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geology

ge.ol.o.gy \je--'a:l-*-je-\ n [NL geologia, fr. ge- + -logia -logy] often 
   attrib  1a: a science that deals with the history of the earth and its life 
   esp. as  recorded in rocks 1b: a study of the solid matter of a celestial 
   body (as the moon)  2: geologic features  3: a treatise on geology