purine /pūrˈin or pūrˈēn/ or purin /pūˈrin/

1. A cyclic double-ring crystalline substance C₅H₄N₄, which with oxygen forms uric acid (C₅H₄N₄O₃), and with many derivatives
2. Any of a number of these derivatives, cyclic diureides, such as adenine and guanine, esp one which is part of the nucleotide chains of DNA and RNA

• callants
• callas
• call a spade a spade
• call-at-large
• call attention to
• call away
• call back
• call-back
• call-backs
• call-barring
• call-bird
• call-birds
• call-box
• call-boxes
• call-boy
• call-boys
• call by
• call centre
• call centres
• call collect
• call cousins
• call down
• called
• called-for
• called to the bar