Webster's English Dictionary

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reservoir

res.er.voir \'rez-*(r)v-.wa:r, -*(r)v-.(w)o.r, -*r-.vo.i\ n [F re`servoir, 
   fr. MF, fr. reserver] 1: a place where something is kept in store : as  1a: 
   an artificial lake where water is collected and kept in quantity for us e 
   1b: a part of an apparatus in which a liquid is held  2: an extra supply : 
   RESERVE  3: an organism in which a parasite that is pathogenic for some 
   other specie s lives and multiplies without damaging its host; also : a 
   noneconomic organism within which a pathogen of economic or medical 
   importance flourishes