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trans-

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  1. 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.
  2. 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).
  3. Astronomy. a prefix denoting something farther from the sun (than a given planet): trans-Martian; trans-Neptunian.
  4. a prefix meaning “on the other side of,” referring to the misalignment of one’s gender identity with one's biological sex assigned at birth: transgender; transsexual.

Origin of trans-

< Latin, combining form of trāns (adv. and preposition) across, beyond, through
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for trans-

trans-

sometimes before s- tran-

prefix
  1. across, beyond, crossing, on the other sidetransoceanic; trans-Siberian; transatlantic
  2. changing thoroughlytransliterate
  3. transcendingtransubstantiation
  4. transverselytransect
  5. (often in italics) indicating that a chemical compound has a molecular structure in which two groups or atoms are on opposite sides of a double bondtrans-butadiene Compare cis- (def. 2)

Word Origin

from Latin trāns across, through, beyond
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 trans-

prefix meaning "across, beyond, to go beyond," from Latin trans-, from prep. trans "across, over, beyond," probably originally present participle of a verb *trare-, meaning "to cross" (see through).

Online Etymology Dictionary, © 2010 Douglas Harper

trans- in Medicine

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 Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.