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Two objects considered together because of similarity, for a common purpose, or because of some attracting force between them.


Two of anything similar in shape, size, and conformation.

base pair

In the double-stranded helical arrangement of DNA, the complementary purine-pyrimidine nucleotide bases (adenine-thymidine or guanine-cytosine) that are linked by weak chemical bonds. The order of these base pairs encode the genetic information in each segment of DNA.

ion pair

Two particles of opposite charge, usually an electron and a proton.
References in periodicals archive ?
Boxer also is an independent director of Wyndam International, Inc., the operating company paired with Patriot American Hospitality, Inc.)
Comparable responses emerged when 16 14-month-olds who had learned one of the label-object combinations were then exposed to the same shape paired with a similar-sounding label.
Jay Melosh of the University of Arizona in Tucson to analyze paired asteroids.
DNA exists in the cell nucleus as long strands of paired nucleotides, or base pairs.
When a material becomes a superconductor, current-carrying electrons behave as if they were paired, even though electrons at close quarters repel each other.