Webster's English Dictionary

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facies

fa.cies \'fa--sh(e--.)e-z\ n or facies [NL, fr. L, face] pl  1: an 
   appearance and expression of the face characteristic of a particular  
   condition 2a: general appearance  2b: a particular local aspect or 
   modification of an ecological community  3: a rock or group of rocks that 
   differ from comparable rocks (as in compos ition)