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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



... experienced by the liberal bourgeoisie during the two days of armed demonstration betrayed itself in a hatred that was crystallized not only in the columns of the newspapers, but also in the streets of Petrograd, and more especially on the Nevsky Prospect, where individual workmen and soldiers caught in the act ...
— From October to Brest-Litovsk • Leon Trotzky
... speaking of the Italian city-republics, we must now turn to say a word respecting the free cities of Germany, in which country, next after Italy, the mediaeval municipalities had their most perfect development, and acquired their ...
— A General History for Colleges and High Schools • P. V. N. Myers
... For a moment Venusta was silent. What was to be done? Her Roman blood ran riot through her veins. Recovering herself, she said ...
— Saronia - A Romance of Ancient Ephesus • Richard Short
... eagerly seeks a bad side to the best things, says that his politeness has no other aim than to make a party for himself, and when he is master of the crown, he will forget or despise us. I do not believe this, and repel such a suspicion as the deepest injustice. ...
— The Continental Monthly, Vol. 4, No. 5, November, 1863 • Various
... was a confirmed pipe-lover. When he and Thornhill and their three companions set out from Gravesend for the final stage, up the river, of their famous "Five Days Peregrination," we are told that they hired a boat with clean straw, and laid in a bottle of wine, pipes, tobacco, and light, and so came ...
— The Social History of Smoking • G. L. Apperson


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