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antiparallel

[an-tee-par-uh-lel, an-tahy-]
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adjective Mathematics, Physics.
  1. (of two vectors) pointing in opposite directions.
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Origin of antiparallel

First recorded in 1650–60; anti- + parallel
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for antiparallel

antiparallel

adjective
  1. physics parallel but pointing in the opposite direction
  2. maths (of vectors) parallel but having opposite directions
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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