antiparallel

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  1. (in biochemistry) (describing of a pair of parallel linear structures, such as two polynucleotide or polypeptide chains, having directional polarity or asymmetry in opposite directions.
  2. (in quantum physics) (of the spins of a pair of electrons occupying the same atomic or molecular orbital) described by different spin quantum numbers. Compare parallel (def. 2).
antiparallelism n.

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parapositronium (particle physics)
parastate (atomic physics)
antiferromagnetic domain (solid-state physics)