Wordnet 3.0
NOUN (1)
1.
a sweet tasting alkaloid that occurs in sugar beets;
The Collaborative International Dictionary of English v.0.48:
Betaine \Be"ta*ine\, n. [From beta, generic name of the beet.]
(Chem.)
A nitrogenous base, C5H11NO2, produced artificially, and
also occurring naturally in beet-root molasses and its
residues, from which it is extracted as a white crystalline
substance; -- called also lycine and oxyneurine. It has a
sweetish taste.
[1913 Webster]
WordNet (r) 3.0 (2006):
betaine
n 1: a sweet tasting alkaloid that occurs in sugar beets