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sub- 
  prefix 
1 situated under or beneath 
subterranean  
2 secondary in rank; subordinate 
subeditor  
3 falling short of; less than or imperfectly 
subarctic, subhuman  
4 forming a subdivision or subordinate part of a whole 
subcommittee  
5  (in chemistry) 
a indicating that a compound contains a relatively small proportion of a specified element 
suboxide  
b indicating that a salt is basic salt 
subacetate  
  (from Latin sub)