a prefix occurring in loanwords from Latin (transcend; transfix ); on this model, used with the meanings “across,” “beyond,” “through,” “changing thoroughly,” “transverse,” in combination with elements of any origin: transisthmian; trans-Siberian; transempirical; transvalue.
Chemistry. a prefix denoting a geometric isomer having a pair of identical atoms or groups on the opposite sides of two atoms linked by a double bond. Compare cis- ( def 2 ).
Astronomy. a prefix denoting something farther from the sun (than a given planet): trans-Martian; trans-Neptunian.

< Latin, combining form of trāns (adv. and preposition) across, beyond, through Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trans- or (sometimes before s-) tran-
1.  across, beyond, crossing, on the other side: transoceanic; trans-Siberian; transatlantic
2.  changing thoroughly: transliterate
3.  transcending: transubstantiation
4.  transversely: transect
5.  (often in italics) Compare cis- indicating that a chemical compound has a molecular structure in which two groups or atoms are on opposite sides of a double bond: trans-butadiene
[from Latin trāns across, through, beyond]
tran- or (sometimes before s-) tran-
[from Latin trāns across, through, beyond]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

prefix meaning "across, beyond, to go beyond," from L. trans-, from prep. trans "across, over, beyond," probably originally prp. of a verb *trare-, meaning "to cross" (see through).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

trans- pref.

  1. Across; on the other side; beyond: transilient.

  2. Through: transpiration.

  3. Change; transfer: transketolation.

  4. Having a pair of identical atoms on opposite sides of two atoms linked by a double bond. Used of a geometric isomer. Usually in italic: trans-butene.

The American Heritage® Stedman's Medical Dictionary
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