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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



... for the baron had sent his sister Edith to a convent for her better education, as he said, and as Wilfred had none of his own kith and kin about him, he avoided all company, save when the routine of each day forced him into the society of his ...
— The Rival Heirs being the Third and Last Chronicle of Aescendune • A. D. Crake
... bait." Then Madame Staubach was compelled to explain that all ideas of matrimony in respect to her niece must be laid aside, and she was driven also to confess that she had persevered too long in regard to Peter Steinmarc. "He certainly is a little rusty for such a young woman as Linda," said Herr Molk, confessing also his part of the fault. At last he counselled Madame Staubach that she could do nothing but follow her niece to Cologne, as she had before followed her to Augsburg. ...
— Linda Tressel • Anthony Trollope
... in the series, which is of greatest interest in the present connexion, is that representing Khnum at his work of creation. He is seated before a potter's wheel which he works with his foot,(1) and on the revolving table he is fashioning two children with his hands, the baby princess and her "double". It was always Hatshepsut's desire to be represented as a man, and so both the children are boys.(2) As yet they are ...
— Legends Of Babylon And Egypt - In Relation To Hebrew Tradition • Leonard W. King
... the night by our fire communicating to the dry moss which, spreading by the force of a strong wind, encircled the encampment and threatened destruction to our canoes and baggage. The watch immediately aroused all the men who quickly removed whatever could be injured to a distant part and afterwards succeeded in ...
— The Journey to the Polar Sea • John Franklin
... who have suffered from apoplexy and other severe diseases of the brain, have an involuntary trembling of the limbs, which results from a weakened state ...
— A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition) • Calvin Cutter


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