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
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)