[bee-tuh-een, -in; bih-tey-een, -in]
noun Chemistry, Pharmacology.
a colorless, crystalline, water-soluble, sweet-tasting alkaloid, C 5 H 11 NO 2 , usually obtained from sugar beets or synthesized from glycine, used chiefly in medicine.
Also, betain [bee-tuh-in, bih-tey-] .

1875–80; < Latin bēta beet + -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
betaine (ˈbiːtəˌiːn, -ɪn, bɪˈteɪiːn, -ɪn)
1.  a sweet-tasting alkaloid that occurs in the sugar beet and other plants and in animals. Formula: C5H11NO2
2.  (plural) a group of chemical compounds that resemble betaine and are slightly basic zwitterions
[C19: from New Latin Bēta beet + -ine²]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

betaine be·ta·ine (bē'tə-ēn', -ĭn)
A sweet crystalline alkaloid occurring in sugar beets and other plants and used in the treatment of muscular degeneration.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
betaine   (bē'tə-ēn', -ĭn)  Pronunciation Key 
  1. Any of a class of organic salts that are derived from amino acids and have a cationic (positively charged) component that consists of a nitrogen atom attached to three methyl (CH3) groups.

  2. A salt of this class that is a sweet crystalline alkaloid first found in sugar beets but also widely occurring in other plants and in animals. Betaine is used in the treatment of muscular weakness and degeneration. Chemical formula: C5H11NO2.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It has been suggested that betaine supplementation may improve muscle strength by increasing muscle creatine content.
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