more than one but indefinitely small in number
a quantifier that can be used with count nouns and is often preceded by `a'; a small but indefinite number
a small elite group
a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
the blood group whose red cells carry the A antigen
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
the 1st letter of the Roman alphabet
the 1st letter of the Roman alphabet
any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
