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A
I. (noun)
Sense 1
Meaning:
The blood group whose red cells carry the A antigen
Synonyms:
A; group A; type A
Classified under:
Hypernyms ("A" is a kind of...):
blood group; blood type (human blood cells (usually just the red blood cells) that have the same antigens)
Sense 2
Meaning:
The 1st letter of the Roman alphabet
Classified under:
Nouns denoting communicative processes and contents
Hypernyms ("A" is a kind of...):
alphabetic character; letter; letter of the alphabet (the conventional characters of the alphabet used to represent speech)
Holonyms ("A" is a member of...):
Latin alphabet; Roman alphabet (the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe)
Sense 3
Meaning:
The basic unit of electric current adopted under the Systeme International d'Unites
Example:
a typical household circuit carries 15 to 50 amps
Synonyms:
A; amp; ampere
Classified under:
Nouns denoting quantities and units of measure
Hypernyms ("A" is a kind of...):
current unit (a measure of the amount of electric charge flowing past a circuit point at a specific time)
Meronyms (parts of "A"):
mA; milliampere (one thousandth of an ampere)
Holonyms ("A" is a part of...):
abamp; abampere (a unit of current equal to 10 amperes)
Sense 4
Meaning:
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:
Classified under:
Nouns denoting quantities and units of measure
Hypernyms ("A" is a kind of...):
metric linear unit (a linear unit of distance in metric terms)
Meronyms (parts of "A"):
micromicron; picometer; picometre (a metric unit of length equal to one trillionth of a meter)
Holonyms ("A" is a part of...):
micromillimeter; micromillimetre; millimicron; nanometer; nanometre; nm (a metric unit of length equal to one billionth of a meter)
Sense 5
Meaning:
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
Synonyms:
A; adenine
Classified under:
Hypernyms ("A" is a kind of...):
purine (any of several bases that are derivatives of purine)
Domain category:
biochemistry (the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistry)
Holonyms ("A" is a substance of...):
deoxyribonucleic acid; desoxyribonucleic acid; DNA ((biochemistry) a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with the transmission of genetic information)
ribonucleic acid; RNA ((biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with microsomes; it transmits genetic information from DNA to the cytoplasm and controls certain chemical processes in the cell)
Sense 6
Meaning:
One of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
Synonyms:
A; deoxyadenosine monophosphate
Classified under:
Nouns denoting substances
Hypernyms ("A" is a kind of...):
base; nucleotide (a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA))
Sense 7
Meaning:
Any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
Synonyms:
A; antiophthalmic factor; axerophthol; vitamin A
Classified under:
Nouns denoting substances
Hypernyms ("A" is a kind of...):
fat-soluble vitamin (any vitamin that is soluble in fats)
Hyponyms (each of the following is a kind of "A"):
retinol; vitamin A1 (an unsaturated alcohol that occurs in marine fish-liver oils and is synthesized biologically from carotene)
dehydroretinol; vitamin A2 (a viscous alcohol that is less active in mammals than is vitamin A1)
Context examples:
I shall enter here some of my notes, as they may refresh my memory when I talk over my travels with Mina.
(Dracula, by Bram Stoker)
His hand was wrapped in a bloody handkerchief, and the right trouser leg was ripped from knee to ankle.
(The Call of the Wild, by Jack London)
A hormone made in the pituitary gland.
(ACTH, The Titi Tudorancea Bulletin)
The shrill little whistle, like the chirping of a cricket amid the cries of great beasts, shot through the fog from more to the side and swiftly grew faint and fainter.
(The Sea-Wolf, by Jack London)
However, at last it was agreed he should go, for he would not rest at home; and as he came to the wood, he met the fox, and heard the same good counsel.
(Fairy Tales, by The Brothers Grimm)
A disintegrin and metalloproteinase with thrombospondin motifs 1 (967 aa, ~105 kDa) is encoded by the human ADAMTS1 gene.
(A Disintegrin and Metalloprotease with Thrombospondin Motifs 1, NCI Thesaurus)
Vitamin A is essential for diverse cellular functions, immune system functions, and maintenance of mucous membranes, while vitamin D regulates calcium and phosphorous metabolism.
(A and D Ointment, NCI Thesaurus)
A disintegrin and metalloproteinase with thrombospondin motifs 9 (1935 aa, ~216 kDa) is encoded by the human ADAMTS9 gene.
(A Disintegrin and Metalloprotease with Thrombospondin Motifs 9, NCI Thesaurus)
While she stood looking eagerly at the strange and beautiful sights, she noticed coming toward her a group of the queerest people she had ever seen.
(The Wonderful Wizard of Oz, by L. Frank Baum)
In Unicode the capital "A" is codepoint U+0041 and the lower case "a" is U+0061.
(A, The Titi Tudorancea Bulletin)
