n.
   - a microorganism, especially one which causes disease.
 - a portion of an organism capable of developing into a new one or part of one. 
▸the embryo in a cereal grain or other plant seed.
 - an initial stage from which something may develop:
 the germ of a brilliant idea.
 
 
  Derivative
  
  Etymology
  ME: via OFr. from L. germen ‘seed, sprout’.