from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A nucleoside derived from adenine and ribose, found in striated muscle tissue.
  • n. An instance of adenosine.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (biochemistry) a nucleoside that is a structural component of nucleic acids; it is present in all living cells in a combined form as a constituent of DNA and RNA and ADP and ATP and AMP


Blend of adenine and ribose.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Blend of adenine + ribose. (Wiktionary)


  • "Bubble boy" disease: severe combined immunodeficiency (SCID) due to a lack of an enzyme called adenosine deaminase.

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  • SCID arises in infants with a genetic defect that leaves them unable to produce an enzyme called adenosine deaminase.

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  • This form of SCID arises in babies with a genetic defect that leaves them deficient of an enzyme called adenosine deaminase.

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  • Food is broken down into sugar units (or partially broken down sugar units) that combine with oxygen to make the body’s energy currency, which is called adenosine triphosphate (ATP).


  • The majority of the oxygen supplied to the cell is utilized by the mitochondria to make a chemical known as adenosine triphosphate, or ATP.

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  • The end result of this cycle is a molecule called adenosine triphosphate ATP, which is packed full of energy for the brain cells to use to produce neurotransmitters, copy segments of DNA, or whatever else is needed for that cell to carry out its functions.

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  • Caffeine blocks adenosine receptors so your brain does not perceive as much adenosine, which is why it can keep you awake.


  • The fuel that our body cells use for energy is actually neither glucose nor fat, it is a chemical called adenosine triphosphate ATP.

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  • Sleep may also actually help restore energy levels in the body by clearing the cells of a sleep-inducing molecule in the brain called adenosine see box.

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  • In a cunning bit of biological multitasking, a compound called adenosine—the backbone of the energy molecule adenosine triphosphate ATP—can put you to sleep when its levels rise in the brain.

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