English dictionary



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English noun: A

1. A (quantity) a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation


Synonymsangstrom, angstrom unit


Broader (hypernym)metric linear unit


Part holonymmicromicron, picometer, picometre


Part meronymmicromillimeter, micromillimetre, millimicron, nanometer, nanometre, nm

2. A (substance) any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes


Synonymsantiophthalmic factor, axerophthol, vitamin A


Broader (hypernym)fat-soluble vitamin


Narrower (hyponym)dehydroretinol, retinol, vitamin A1, vitamin A2

3. A (substance) one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)


Synonymsdeoxyadenosine monophosphate


Broader (hypernym)base, nucleotide

4. A (substance) (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA


Synonymsadenine


Broader (hypernym)purine


Substance meronymdeoxyribonucleic acid, desoxyribonucleic acid, DNA, ribonucleic acid, RNA


Domain categorybiochemistry

5. A (quantity) the basic unit of electric current adopted under the Systeme International d'Unites


SamplesA typical household circuit carries 15 to 50 amps.


Synonymsamp, ampere


Broader (hypernym)current unit


Part holonymmA, milliampere


Part meronymabamp, abampere

6. A (communication) the 1st letter of the Roman alphabet


Broader (hypernym)alphabetic character, letter, letter of the alphabet


Member meronymLatin alphabet, Roman alphabet

7. A (body) the blood group whose red cells carry the A antigen


Synonymsgroup A, type A


Broader (hypernym)blood group, blood type









Based on WordNet 3.0 copyright © Princeton University.
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