[ thee-uh-fil-een, -in ]
/ ˌθi əˈfɪl in, -ɪn /
a white, crystalline, poisonous alkaloid, C7H8N4O2, an isomer of theobromine, extracted from tea leaves or produced synthetically: used to relieve bronchial spasms, in the treatment of certain heart conditions, and as a diuretic.
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Words nearby theophylline
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
Example sentences from the Web for theophylline
Caffeine, theophylline, and theobromine are not found in animal tissues, but are fairly widely distributed in plants.The Chemistry of Plant Life|Roscoe Wilfred Thatcher
British Dictionary definitions for theophylline
/ (ˌθɪəˈfɪliːn, -ɪn, θɪˈɒfɪlɪn) /
a white crystalline slightly water-soluble alkaloid that is an isomer of theobromine: it occurs in plants, such as tea, and is used to treat asthma. Formula: C 7 H 8 N 4 O 2See also xanthine (def. 2)
Word Origin for theophylline
C19: from theo (bromine) + phyllo- + -ine ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for theophylline
[ thē-ŏf′ə-lĭn, thē′ō-fĭl′ēn′ ]
A colorless crystalline alkaloid derived from tea leaves or made synthetically, used as a cardiac stimulant and diuretic.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for theophylline
[ thē-ŏf′ə-lĭn ]
A colorless, crystalline alkaloid derived from tea leaves or made synthetically. It is used in medicine especially as a bronchial dilator. Theophylline is a xanthine that is similar in structure to caffeine and is a structural isomer of theobromine. Chemical formula: C7H8N4O2.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.