Pronunciation: (sub), [key]
—n., v., subbed, sub•bing. Informal.
1. a submarine.
2. a substitute.
3. a submarine sandwich. See hero sandwich.
4. a subcontractor.
5. a sublieutenant.
6. a subordinate.
7. a subaltern.
8. Brit.an advance against one's wages, esp. one granted as a subsistence allowance.
9. Photog.a substratum.
to act as a substitute for another.
Photog.to coat (a film or plate) with a substratum.
supplemental unemployment benefits.
1. a prefix occurring originally in loanwords from Latin (subject; subtract; subvert; subsidy); on this model, freely attached to elements of any origin and used with the meaning “under,” “below,” “beneath” (subalpine; substratum), “slightly,” “imperfectly,” “nearly” (subcolumnar; subtropical), “secondary,” “subordinate” (subcommittee; subplot).
a. a prefix indicating a basic compound: subacetate; subcarbonate; subnitrate.
b. a prefix indicating that the element is present in a relatively small proportion, i.e., in a low oxidation state: subchloride; suboxide. Also,su-,suc-,suf-,sug-,sum-,sup-,sur-,sus-.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.