Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. of vectors, parallel but of opposite direction
  • adj. describing the orientations of the two strands of DNA
  • adj. describing two beta strands comprising a protein's secondary structure that are aligned and hydrogen bonded but the vector describing the amino- and carboxy-terminal ends of each strand are oriented 180° relative to one another.
  • n. A line that forms equal angles with two other lines, but in opposite directions.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Running in a contrary direction.

from The Century Dictionary and Cyclopedia

  • Running parallel but in a contrary direction.
  • n. In geometry, one of two or more lines which make equal angles with two other lines, but in contrary order.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. (especially of vectors) parallel but oppositely directed

Etymologies

anti- +‎ parallel (Wiktionary)

Examples

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