A sweet tasting alkaloid that occurs in sugar beets WordNet 3.0 & Open English WordNet

A betaine in chemistry is any neutral chemical compound with a positively charged cationic functional group that bears no hydrogen atom, such as a quaternary ammonium or phosphonium cation, and with a negatively charged functional group, such as a carboxylate group that may not be adjacent to the cationic site. Wikipedia

Charge-separated, neutral molecule having both a fully-substituted onium atom and a non-adjacent anionic atom Wikidata

Any similar compound, based on sulfur or phosphorus etc, having an onium ion with no hydrogen atom adjacent to the anionic atom. Wiktionary