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Symbol, Chemistry.
  1. selenium.


or S.E.

  1. southeast.
  2. southeastern.
  3. Standard English.


  1. a prefix occurring in loanwords from Latin, where it meant “apart”: seduce; select.

Origin of se-

< Latin sē(d) (preposition), sē- (prefix) without, apart
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for se

Contemporary Examples

Historical Examples

  • After which, thar ain't no se'f respectin' camp that'll stand for my game.'

    Faro Nell and Her Friends

    Alfred Henry Lewis

  • "I'se warrant he's gleb eneuch to call for his siller when it's due to him," said a third.

    One Of Them

    Charles James Lever

  • By this ye may se it is harde to fynde a woman wythout an excuse.

  • By this a man may se, that a womans answer is neuer to seke.

  • By this tale ye may se, that the children in this our tyme be very prudent to get money.

British Dictionary definitions for se


the internet domain name for
  1. Sweden


the chemical symbol for
  1. selenium


symbol for
  1. southeast(ern)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for se


word-forming element, from Latin se-, collateral form of sed- "without, apart, aside, on one's own," related to sed, Latin reflexive pronoun (accusative and ablative), from PIE *sed-, extended form of root *s(w)e-, pronoun of the third person and reflexive (cf. German sich; see idiom).

Online Etymology Dictionary, © 2010 Douglas Harper

se in Medicine


  1. The symbol for the elementselenium

se in Science


  1. The symbol for selenium.


  1. A nonmetallic element that occurs in a gray crystalline form, as a red powder, or as a black glassy material. It is highly photosensitive and can be used to convert light into electricity. Its ability to conduct electricity also increases with higher exposure to light. For these reasons selenium is used in photocopying technology, photography, and solar cells. Atomic number 34; atomic weight 78.96; melting point 217°C; boiling point 684.9°C; specific gravity (gray) 4.79; (red) 4.5; (black) 4.28; valence 2, 4, or 6. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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