1. 
   Poisson
   [crater] This heavily eroded crater shares a common floor with the satellite crater Poisson T to the west-southwest, and the two craters have more or less merged into a single formation with a narrower neck in between. The rim of Poisson is heavily eroded, and is overlain by several craters....
   Found op http://en.wikipedia.org/wiki/Poisson_(crater)
   
   
2. 
   Poisson
   any type of fish.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   Poisson
   Type: Term Pronunciation: pwah-son[h]′ Definitions: 1. Siméon Denis, French mathematician, 1781-1840. See: Poisson distribution, Poisson-Pearson formula
   Found op http://www.medilexicon.com/medicaldictionary.php?t=70673
   
   
4. 
   Poisson
   A formula sometimes used for calculating trunks. Assumes that if callers get busy signals, they keep trying until they successfully get through. Since some callers won't keep retrying, Poisson can overestimate trunks required. See Erlang B and Retrial Tables.
   Found op http://www.confero.co.uk/glossary.htm
   
   
5. 
   Poisson
   Fish
   Found op http://www.cellartours.com/france/french-a-z-food-dictionary-glossary.html
   
   

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