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A   /ə/  /eɪ/   Listen
A

noun
1.
A metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation.  Synonyms: angstrom, angstrom unit.
2.
Any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes.  Synonyms: antiophthalmic factor, axerophthol, vitamin A.
3.
One of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose).  Synonym: deoxyadenosine monophosphate.
4.
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA.  Synonym: adenine.
5.
The basic unit of electric current adopted under the Systeme International d'Unites.  Synonyms: amp, ampere.
6.
The 1st letter of the Roman alphabet.
7.
The blood group whose red cells carry the A antigen.  Synonyms: group A, type A.



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A battery
a bit
a capella singing
a cappella
a cappella singing
a couple of
a few
a fortiori
a good deal
a great deal
A horizon
a hundred times
a Kempis
a la carte
a la mode
A level
a little
a lot
a million times
a posteriori
a priori
a trifle
A'man
A-bomb
A-horizon
A-line
A-list
a-ok
a-okay
A-one
A-scan ultrasonography
A-team
5-hydroxy-3-methylglutaryl-coenzyme A reductase
abatement of a nuisance
after a fashion
al-Gama'a al-Islamiyya
Al-Jama'a al-Islamiyyah al-Muqatilah bi-Libya
all of a sudden
as a formality
as a group
as a matter of fact
at a loss
at a low price
at a lower place
at a time
beat a retreat
beyond a doubt
beyond a shadow of a doubt
blow a fuse
botulinum toxin A


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"A" Quotes from Famous Books



... Azzah, freest with our name and fame! By Allah! would I near her off she flies * At tangent, granting less the more I claim: I dote on Azzah, but when clear I off * My rivals, clears me too that dearest dame; Like wandering wight that chose for shade a cloud * Which, ere siesta ...
— The Book of the Thousand Nights and a Night, Volume 2 • Richard F. Burton
... the berries, as their mother pulled the molasses pitcher from the shelf. But there was not a drop in it. ...
— Some Three Hundred Years Ago • Edith Gilman Brewster
... Cleombrotus exclaim'd, Then plung'd from off a height beneath the sea; Stung by pain, of no disgrace ashamed, But ...
— The Academic Questions • M. T. Cicero
... general death-rate is directly affected by the number of children living in a community is shown ...
— Rural Hygiene • Henry N. Ogden
... party shall not marry till six months after; and because many families are compelled to live niggardly, exhaust and undone by great dowers, [668]none shall be given at all, or very little, and that by supervisors rated, they that are foul shall have a greater portion; if fair, none at all, or very little: [669]howsoever not to exceed such a rate as those supervisors shall think fit. And when once they come to those years, poverty shall hinder no man from marriage, or any ...
— The Anatomy of Melancholy • Democritus Junior


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