rhamnose

from The Century Dictionary.

• noun A crystalline substance, CH₃(CH.OH)₄.CHO + H₂O, made by boiling quercitin, etc., with dilute sulphuric acid. It melts at 92–93° C. Also called isodulcite.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biochemistry A methyl-pentose, 6-deoxy-L-mannose, which occurs in the leaves and flowers of poison ivy and is a constituent of many plant glycosides.