antiparallel

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an·ti·par·al·lel

(an'tē-par'ă-lel),
1. Denoting molecules that are parallel but have opposite directional polarity, for example, the two strands of a DNA double helix.
2. Denoting the spins of two electrons occupying the same orbital area but with different spin quantum numbers.
Farlex Partner Medical Dictionary © Farlex 2012

antiparallel

(ăn′tē-păr′ə-lĕl′, ăn′tī-)
adj.
Of or relating to two adjacent molecules whose sequences of atoms or other elements run in opposite directions: antiparallel strands of DNA.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

antiparallel

Of two structures that lie parallel to each other but that run in opposite directions. The best-known example of antiparalellism is that of the two strands in the DNA molecule.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005