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Wiktionary
aglycone

n. (context organic chemistry English) The non-sugar fragment of a glycoside.

Wikipedia
Aglycone

An aglycone, or aglycon, is the compound remaining after the glycosyl group on a glycoside is replaced by a hydrogen atom.

For example, the aglycone of a cardiac glycoside would be a steroid molecule.

Classes of phytochemicals found in the aglycone and glycosides forms :

  • Polyphenols