
1) Elementary geometry 2) Parallel
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1) Parallel
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https://www.crosswordclues.com/clue/antiparallel
[biochemistry] In biochemistry, two biopolymers are antiparallel if they run parallel to each other but with opposite alignments. An example is the two complementary strands of a DNA double helix, which run in opposite directions to one another. ==Nucleic acids== Nucleic acid molecules have a phosphoryl (5`) and a hydroxyl (3`) end. This no...
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http://en.wikipedia.org/wiki/Antiparallel_(biochemistry)
[electronics] In electronics, two anti-parallel or inverse-parallel devices are connected in parallel but with their polarities reversed. One example is the TRIAC, which is comparable to two thyristors connected back-to-back (in other words, reverse parallel), but on a single piece of silicon. Two LEDs can be paired this way, so that each p...
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http://en.wikipedia.org/wiki/Antiparallel_(electronics)
[mathematics] In geometry, anti-parallel lines can be defined with respect to either lines or angles. ==Antiparallel vectors== In a Euclidean space, two directed line segments, often called vectors in applied mathematics, are antiparallel, if they are supported by parallel lines and have opposite directions. In that case, one of the associa...
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http://en.wikipedia.org/wiki/Antiparallel_(mathematics)

• (a.) Running in a contrary direction.
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http://thinkexist.com/dictionary/meaning/antiparallel/

<molecular biology> Having the opposite polarity (for example the two strands of a DNA molecule). ... (18 Nov 1997) ...
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(an″te-) (an″ti-par´ә-lel) denoting molecules that are arranged side by side, but in opposite directions. For example, the strands of deoxyribonucleic acid are antiparallel, with their 5′ to 3′ linkages running in opposite directions.
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Having the opposite polarity (eg. the two strands of a DNA molecule).
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An`ti·par'al·lel adjective Running in a contrary direction.
Hammond. Found on
http://www.encyclo.co.uk/webster/A/96

Type: Term Pronunciation: an′tē-par′ă-lel Definitions: 1. Denoting molecules that are parallel but have opposite directional polarity, the two strands of a DNA double helix. 2. Denoting the spins of two electrons occupying the same orbital area but with different spin quantum numbers.
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http://www.medilexicon.com/medicaldictionary.php?t=5044

Antiparallel: A term applied to two molecules that are side by side but run in opposite directions. The two strands of DNA are antiparallel. The head of one strand is always laid against the tail of the other strand of DNA.
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[
adj] - (especially of vectors) parallel but oppositely directed
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http://www.webdictionary.co.uk/definition.php?query=antiparallel

two strands of DNA helix oriented in opposite directions; one strand is oriented in the 5’ to 3’ direction, while the other is oriented in the 3’ to 5’ direction
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adjective (especially of vectors) parallel but oppositely directed; `antiparallel vectors`
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(of two vectors) pointing in opposite directions.
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No exact match found.