[suhb] Informal.
a submarine.
a substitute.
a submarine sandwich. See hero sandwich.
a subcontractor.
a sublieutenant.
a subordinate.
a subaltern.
British. an advance against one's wages, especially one granted as a subsistence allowance.
Photography. a substratum.
verb (used without object), subbed, subbing.
to act as a substitute for another.
verb (used with object), subbed, subbing.
Photography. to coat (a film or plate) with a substratum.

by shortening of words prefixed with sub-

3. See hero sandwich. Unabridged


supplemental unemployment benefits.


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 prefix indicating a basic compound: subacetate; subcarbonate; subnitrate.
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-.

< Latin, combining form representing sub (preposition); akin to Greek hypó; see hypo- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
sub (sʌb)
1.  subaltern subeditor submarine subordinate subscription substandard substitute See substratum short for several words beginning with sub-
2.  informal (Brit) Formal term: subsistence allowance an advance payment of wages or salary
vb , subs, subbing, subbed
3.  (intr) to serve as a substitute
4.  informal (intr) to act as a substitute (for)
5.  informal (Brit) to grant or receive (an advance payment of wages or salary)
6.  informal (tr) short for subedit
7.  (tr) photog to apply a substratum to (a film or plate base)

abbreviation for
1.  subeditor
2.  subito (in music)
3.  subscription
4.  substitute

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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

prefix of L. origin meaning "under," from L. preposition sub "under" (also "close to, up to, towards"), from a variant form (*(s)up-, perhaps representing *ex-upo-) of PIE base *upo- "from below," hence "turning upward, upward, up, up from under, over, beyond" (cf. Skt. upa "near, under, up to, on,"
Gk. hypo "under," Goth. iup, O.N., O.E. upp "up, upward," Hittite up-zi "rises"). Used as a prefix and in various combinations. The original meaning is now obscured in many words from Latin (suggest, suspect, subject, etc.); the prefix is active in Mod. Eng., however, sometimes meaning "subordinate" (as in subcontinent, first recorded 1863) or "inferior" (a sense first attested 1963). Many such words are transparent (e.g. subcommittee, 1610) and etymologies of their root words may be found under those headings. As a word of its own, sub is first recorded 1830, as a shortened form of substitute (originally of printer's substitutes). The verb in this sense is from 1853.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sub- pref.

  1. Below; under; beneath: subcutaneous.

  2. Subordinate; secondary: subinfection.

  3. Subdivision: subkingdom.

  4. Less than completely or normally; nearly; almost: subfertility.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
A prefix that means "underneath or lower" (as in subsoil), "a subordinate or secondary part of something else" (as in subphylum.), or "less than completely" (as in subtropical.)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

SUB definition


The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Abbreviations & Acronyms
  1. submarine

  2. substitute

  1. subaltern

  2. suburb

  3. suburban

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The hatch is closed, the sub is on the hook and the crane is lowering me down.
Grant sub award or subcontracting experience is desirable.
The sub then slid back into the water stern-first before finally coming to rest
  on the surface.
Sub critical means that more neutrons are being absorbed or are escaping the
  system then are creating new fissions.
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