The Collaborative International Dictionary of English v.0.48:

Quercitin \Quer"ci*tin\ (kw[~e]r"s[i^]*t[i^]n), n. (Chem.)
   A yellow crystalline substance, occurring quite widely
   distributed in the vegetable kingdom, as in apple-tree bark,
   horse-chestnut leaves, etc., but originally obtained by the
   decomposition of quercitrin. Called also meletin.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Meletin \Mel"e*tin\, n. (Chem.)
   See Quercitin.
   [1913 Webster]