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pair

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

pair

(par)
1. a combination of two related, similar, or identical entities or objects.
2. in cardiology, two successive premature beats, particularly two ventricular premature complexes.

base pair  either of the two pairs—guanine and cytosine, adenine and thymine —of purine-pyrimidine bases joined by hydrogen bonds that make up DNA.

pair

1 two corresponding items similar in form and function.
2 one object composed of two joined interdependent parts. See also base pair.

pair

(par)
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 classic literature ?
She had got a baby - oh, there were a pair of babies when she gave birth to this child sitting here, that Friday night
That those terms which fall under the heads of 'positives' and 'privatives' are not opposed each to each as contraries, either, is plain from the following facts: Of a pair of contraries such that they have no intermediate, one or the other must needs be present in the subject in which they naturally subsist, or of which they are predicated; for it is those, as we proved,' in the case of which this necessity obtains, that have no intermediate.
He groaned, and the figure turned its head, showing a pair of little gold rings half hidden in curly black hair.
A sense of accomplished happiness now made the step of the young pair lighter; they saw neither heaven, nor earth, nor houses; they flew, as it were, on wings to the church.
I'll tell you what, I will make each of them a shirt, and a coat and waistcoat, and a pair of pantaloons into the bargain; and do you make each of them a little pair of shoes.
By day I would have charged the great banth itself, had I thought it necessary, but hemmed in by the darkness of these silent pits I hesitated before a pair of eyes.
She got worse and worse until she was sicker than ever the Hammond twins were, even the last pair.
the Sheep asked, handing her a pair of knitting- needles as she spoke.
The Kearney brothers had divided a suit between them, the elder wearing a tightly-fitting, single-breasted blue frock-coat and a pair of pink striped cotton trousers, while the younger candidly displayed the trousers of his brother's suit, as a harmonious change to a shining black alpaca coat and crimson neckerchief.
Another and far more important reason than the delivery of a pair of embroidered gloves, impelled Hester, at this time, to seek an interview with a personage of so much power and activity in the affairs of the settlement.
They are an uncommonly handsome pair," he said, "and if they are as good as they look I am sure you need not wish for anything better; but I see you still hold that pet scheme of yours for worrying your horses and lessening their power.
Their yearly clothing consisted of two coarse linen shirts, one pair of linen trousers, like the shirts, one jacket, one pair of trousers for winter, made of coarse negro cloth, one pair of stockings, and one pair of shoes; the whole of which could not have cost more than seven dollars.