a white, odorless, crystalline powder, CHN·CHO, obtained from the hydrolysis of yeast nucleic acid: it is a nucleoside consisting of adenine and ribose
See adenosine in American Heritage Dictionary 4
(ə-dĕnˈə-sēnˌ)
noun
A nucleoside, C10H13N5O4, composed of adenine linked to ribose, that is a structural component of nucleic acids and the major molecular component of ADP, AMP, and ATP.