sub-
(Latin: under, below [suc-, suf-, sug-, sum-, sup-, sur-, sus-]; used as a prefix)
Don't confuse the sur- in this element with the sur- in super-. Note: sub- regularly means "under", but it often changes its form as it retains its meaning:
The prefix sub- often becomes suc- before c: succumb.
The prefix sub- often becomes suf- before f: suffuse.
The prefix sub- often becomes sug- before g: suggest.
The prefix sub- often becomes sum- before m: sumptuous.
The prefix sub- often becomes sup- before p: suppression.
The prefix sub- often becomes sur- before r: surrogate.
The prefix, sub- is often simplified to su- before sp. Before c, p, and t; it is sometimes formed into sus-; as seen in suspect, suspend, suspicion, suspension, et al.
subsonic
substance
substandard
substantial
substantiate, substantially
substantiation
substellar
substitute
substitution
substitutional
substrata
substratosphere
The lowest layer of the Earth's atmosphere, at a height of about 12 miles/20 km above the Earth.
substratum
substructure
1. The supporting part of a structure; the foundation.
2. The earth bank or bed supporting railroad tracks.
3. Any underlying structure that supports or gives strength to something.
subsurface
Relating to, or situated in an area beneath a surface; especially, the surface of the earth or of a body of water.
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