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

• xanthoxyls
• Xanthura
• Xantippe
• x-axis
• X-body
• X-chromosome
• X-craft
• xd
• Xe
• xebec
• xebecs
• Xema
• xen-
• Xenarthra
• xenarthral
• xenia
• xenial
• xenias
• Xenical
• xenium
• xeno-
• xenobiotic
• xenobiotics
• xenocryst
• xenocrysts