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 (synset 113679721)
    hypernym: metric linear unit - a linear unit of distance in metric terms
    part holonym: micromicron, picometer, picometre - a metric unit of length equal to one trillionth of a meter
    part meronym: micromillimeter, micromillimetre, millimicron, nanometer, nanometre, nm - a metric unit of length equal to one billionth of a meter
    synonym: angstrom, angstrom unit
  2. Any of several fat-soluble vitamins essential for normal vision;
    Prevents night blindness or inflammation or dryness of the eyes (synset 115114370)
    hypernym: fat-soluble vitamin - any vitamin that is soluble in fats
    hyponym:
    • 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
    synonym: 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) (synset 114853735)
    hypernym: base, nucleotide - a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA)
    synonym: deoxyadenosine monophosphate
  4. (biochemistry) purine base found in DNA and RNA;
    Pairs with thymine in DNA and with uracil in RNA (synset 114731050)
    domain category: biochemistry - the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistry
    hypernym: purine - any of several bases that are derivatives of purine
    substance meronym:
    • 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
    synonym: adenine
  5. The basic unit of electric current adopted under the Systeme International d'Unites (synset 113658855)
    "a typical household circuit carries 15 to 50 amps"
    hypernym: current unit - a measure of the amount of electric charge flowing past a circuit point at a specific time
    part holonym: ma, milliampere - one thousandth of an ampere
    part meronym: abamp, abampere - a unit of current equal to 10 amperes
    synonym: amp, ampere
  6. The 1st letter of the Roman alphabet (synset 106844227)
    hypernym: alphabetic character, letter, letter of the alphabet - the conventional characters of the alphabet used to represent speech
    member meronym: latin alphabet, roman alphabet - the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe
  7. The blood group whose red cells carry the A antigen (synset 105408203)
    hypernym: blood group, blood type - human blood cells (usually just the red blood cells) that have the same antigens
    synonym: group a, type a

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