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Antiparallel (mathematics)
WordNet
adjective
(1) (especially of vectors) parallel but oppositely directed
"Antiparallel vectors"
WiktionaryText
Adjective
antiparallel
- of vectors, parallel but of opposite direction
- describing the orientations of the two strands of DNA
- 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.