thujone \thu"jone\ (th[=u]"j[=o]n), n.
An oil, {C10H16O}, the chief constituent of cedar leaf oil
(thuja oil), which is obtained from the northern white cedar
(arbor vitae, {Thuja occidentalis}) or the western Red Cedar
({Thuja plicatis}). It is a stimulant similar to camphor. It
is also called {thujol}, {thuyol}, {absinthol}, {thuyone},
{tanacetol}, and {tanacetone}. --Stedman.
[PJC]