Usually means: Asthma medication, relaxes bronchial muscles.
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We found 25 dictionaries that define the word theophylline:

General (15 matching dictionaries)
  1. theophylline: Merriam-Webster
  2. theophylline: Oxford Learner's Dictionaries
  3. theophylline: American Heritage Dictionary of the English Language
  4. theophylline: Collins English Dictionary
  5. theophylline: Vocabulary.com
  6. Theophylline, theophylline: Wordnik
  7. theophylline: Wiktionary
  8. theophylline: Webster's New World College Dictionary, 4th Ed.
  9. theophylline: Infoplease Dictionary
  10. theophylline: Dictionary.com
  11. Theophylline: Wikipedia, the Free Encyclopedia
  12. theophylline: Rhymezone
  13. theophylline: FreeDictionary.org
  14. theophylline: Mnemonic Dictionary
  15. theophylline: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. theophylline: Encyclopedia

Medicine (9 matching dictionaries)
  1. theophylline: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Medical Dictionary (No longer online)
  4. Theophylline: Merck Manuals
  5. online medical dictionary (No longer online)
  6. Allergy Glossary (No longer online)
  7. theophylline: Dictionary of Cancer Terms
  8. theophylline: Medical dictionary
  9. Hyperdictionary (No longer online)

(Note: See theophyllines as well.)

Definitions from Wiktionary (theophylline)

noun:  (organic chemistry, pharmacology) A bitter crystalline compound present in small quantities in tea leaves, isomeric with theobromine; used as a drug in therapy for respiratory diseases.

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