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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



... days after these horrid outrages, in the midst of which the king and queen were dragged as captives to Paris, the city sent a deputation to request the queen to appear at the theater, and thus to prove, by participating in those gay festivities, that it was with pleasure that she resided in her capital. With much dignity the queen replied, "I should, with great pleasure, accede to the invitation ...
— Maria Antoinette - Makers of History • John S. C. (John Stevens Cabot) Abbott
... the idea of the proposal she imagined he was going to make of taking her boy away to give him the careful education she had often craved for him. She should refuse it, as she would everything else which seemed to imply that she acknowledged a claim over Leonard; but yet sometimes, for her boy's sake, she had longed for a larger opening—a ...
— Ruth • Elizabeth Cleghorn Gaskell
... Mark, Ruth studied the same books that he did, and was a better scholar. In spite of this she looked up to him in everything, and regarded him with the greatest admiration. Although quiet and studious, she had crinkly brown hair, and a merry twinkle in her eyes that indicated a ready humor and a thorough ...
— Wakulla - A Story of Adventure in Florida • Kirk Munroe
... merry in their conversation, and might have been heard at some distance; far above the sound of their carriage wheels or horses' hoofs. They came on noisily, to where a stile and footpath indicated their point of separation. Here ...
— Life And Adventures Of Martin Chuzzlewit • Charles Dickens
... of foot, and when he had gained the top of the rising ground he turned for one second to laugh again. But the laugh died on his lips, as a voice—audible even above all the hubbub and confusion—the shrill voice ...
— Adrien Leroy • Charles Garvice


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