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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
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.
antiparallelOf 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