What is the meaning of Antiparallel?

(of vectors) Parallel but in opposite directions.

1. Describing the orientations of the two strands of DNA.
2. 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.

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 where the vectors describing the amino- and carboxy-terminal ends of each strand are oriented 180° relative to one another.

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

antiparallel

Source: wiktionary.org