The Collaborative International Dictionary of English v.0.48:

Cedriret \Ce"dri*ret\ (s[=e]"dr[i^]*r[e^]t), n.
   Same as C[oe]rulignone.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coerulignone \C[oe]`ru*lig"none\, n. [L. coeruleus cerulean +
   lignum wood + E. quinone.] (Chem.)
   A bluish violet, crystalline substance obtained in the
   purification of crude wood vinegar. It is regarded as a
   complex quinone derivative of diphenyl; -- called also
   cedriret.
   [1913 Webster]