a

This word does not have a syllable breakdown in our dictionary yet, so pronunciation and parts are not shown.

noun. One of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose).

noun. The blood group whose red cells carry the A antigen.

noun. Any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes.

noun. The basic unit of electric current adopted under the Systeme International d'Unites.