thujone /(thū"jōn)/

thu·jone

thujone

n.
  1. 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.