SkyfireDict

a   (TTS Sound)

The noun a has 7 senses

• 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)


• 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)


• deoxyadenosine monophosphate, A -- (one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose))


• adenine, A -- ((biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA)


• 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")


• A, a -- (the 1st letter of the Roman alphabet)


• A, type A, group A -- (the blood group whose red cells carry the A antigen)