Noun

• S: (n) angstrom, angstrom unit, A (a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation)
• S: (n) vitamin A, antiophthalmic factor, axerophthol, A (any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes)
• S: (n) deoxyadenosine monophosphate, A (one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose))
• S: (n) adenine, A ((biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA)
• S: (n) ampere, amp, A (the basic unit of electric current adopted under the Systeme International d'Unites) "a typical household circuit carries 15 to 50 amps"
• part meronym
• direct hypernym / inherited hypernym / sister term
• part holonym
• S: (n) A, a (the 1st letter of the Roman alphabet)
• S: (n) A, type A, group A (the blood group whose red cells carry the A antigen)