antiparallel

From anti- + parallel.

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antiparallel (not comparable)

1. (mathematics) (of vectors) Parallel but in opposite directions.
   1. (biochemistry) Describing the orientations of the two strands of DNA.
      • 2015 October 16, “Polyanionic Carboxyethyl Peptide Nucleic Acids ( ce -PNAs): Synthesis and DNA Binding”, in PLOS ONE‎^[1], →DOI:

        Upon interaction with ss- nucleic acid (NA) targets (deoxyribooligonucleotides (ODNs) or ribooligonucleotides), they form very stable anti-parallel and parallel duplexes [3 ], and the melting temperatures of the antiparallel duplexes are 10 to 15°C higher than those of the parallel duplexes.

   2. (biochemistry) Describing two beta strands comprising a protein's secondary structure that are aligned and hydrogen bonded but where the vectors describing the amino- and carboxy-terminal ends of each strand are oriented 180° relative to one another.

antiparallel (plural antiparallels)

1. (geometry) A line that forms equal angles with two other lines, but in opposite directions.

Friom anti- +‎ parallel.

antiparallel (strong nominative masculine singular antiparalleler, not comparable)

1. antiparallel

• “antiparallel” in Duden online