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)
  2. Any of several fat-soluble vitamins essential for normal vision;
    Prevents night blindness or inflammation or dryness of the eyes (synset 115114370)
  3. One of the four nucleotides used in building DNA;
    All four nucleotides have a common phosphate group and a sugar (ribose) (synset 114853735)
  4. (biochemistry) purine base found in DNA and RNA;
    Pairs with thymine in DNA and with uracil in RNA (synset 114731050)
  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"
  6. The 1st letter of the Roman alphabet (synset 106844227)
  7. The blood group whose red cells carry the A antigen (synset 105408203)

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