A, n.
the blood group whose red cells carry the A antigen
<noun.body>
A group A type A
semantic pointers
hypernym
the 1st letter of the Roman alphabet
<noun.communication>
A a
semantic pointers
member holonym
hypernym
the basic unit of electric current adopted under the Systeme International d'Unites
<noun.quantity> freq. cnt.: 4 freq. cnt.: 4
A amp ampere
sample sentences
"a typical household circuit carries 15 to 50 amps"
a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
<noun.quantity>
A angstrom angstrom unit
semantic pointers
hypernym
part meronym
part holonym
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
<noun.substance>
A adenine
semantic pointers
domain of synset (topic)
hypernym
substance holonym
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
<noun.substance>
A deoxyadenosine monophosphate
semantic pointers
hypernym
any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
<noun.substance>
A antiophthalmic factor axerophthol vitamin A
semantic pointers
hypernym
hyponym