antiparallel

/AE0 N T IY0 P EH1 R AH0 L EH0 L/

noun

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

adjective

1
Of vectors, parallel but of opposite direction
2
Describing the orientations of the two strands of DNA
3
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.

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