Anti-parallel

antiparallel

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

Origin:
1650–60; anti- + parallel

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World English Dictionary
antiparallel (ˌæntɪˈpærəˌlɛl)
 
adj
1.  physics parallel but pointing in the opposite direction
2.  maths (of vectors) parallel but having opposite directions

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