anti parallel

an·ti·par·al·lel

[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) [Click for IPA pronunciation guide]
 
adj
1.  physics parallel but pointing in the opposite direction
2.  maths (of vectors) parallel but having opposite directions

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Anti parallel is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
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