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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


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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