antiparallel

/ˌæntiˈpɛrəˌlɛl/
adjective
  1. Running in opposite directions but parallel to each other, especially in geometry or biochemistry (e.g., DNA strands).
    • The two DNA strands are antiparallel, meaning they run in opposite directions.
    • The antiparallel arrangement of the fibers gives the material extra strength.
    • In the diagram, the antiparallel lines never meet.
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