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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" Quotes from Famous Books



... all search was in vain, but one day the wife of a miller named Semenil came into town ostensibly to buy provisions, but really to denounce them as being concealed, with two other Camisards, ...
— Massacres Of The South (1551-1815) - Celebrated Crimes • Alexandre Dumas, Pere

... perspiration bead out on her forehead as if some thought her mind had found itself confronting actually sickened her. He waited an instant, breathless in an agony of doubt whether to notice or to go on pretending to ignore. After a moment ...
— Mary Wollaston • Henry Kitchell Webster

... important market for Philippine tobacco, but since that country lost her colonies she has no longer any patriotic interest in dealing with any particular tobacco-producing country. The entry of Philippine tobacco into the United States is checked by a Customs duty, respecting which there is, at present, a very lively contest between the tobacco-shippers in the Islands and the Tobacco Trust in America, the former clamouring for, and the latter against, ...
— The Philippine Islands • John Foreman

... or reality, he could not possibly say which. And while he talked and Dick listened, vacillating between amusement and conviction, some twenty stalwart figures, thin and aquiline of feature, copper-hued of skin, and strangely clothed, came creeping up out of the darkness until they reached a clump of bush within earshot of the pair, where they lurked, waiting patiently until the audacious intruders upon their most sacred territory should resign themselves to sleep—and to a captivity which, as planned by the chief figure of the group, was to be of but brief duration, ending ...
— Two Gallant Sons of Devon - A Tale of the Days of Queen Bess • Harry Collingwood

... eye, that the growth of tails among mankind in China is not limited to the appendage of hair which reposes gracefully on the back, and saturates with grease the outer garment of every high or low born Celestial. Elongation of the spine is, at any rate, common enough for Dr Wang to treat it as a disease and specify the remedy, which consists in tying a piece of medicated thread tightly round it, and tightening the thread from time to time until the tail drops off. In order, however, to guard against its growing again, a course of medicine has to ...
— Chinese Sketches • Herbert A. Giles


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