ethereal oil n.
See volatile oil.
The active principle seems to be filicic acid and the ethereal oil.
This is the ethereal oil, first described, in its purest form.
When distilled with water, ethereal oil comes over, and resin remains in the retort.
Distilled with water, ethereal oil and some acid pass over, and the residuum consists chiefly or entirely of acid-resin.
The pungent taste of pepper is due to a resin and the odor is due to an ethereal oil.
The bark is quite thick and contains only a small amount of volatile or ethereal oil.
Chavibetol, an isomer of eugenol, occurs in the ethereal oil obtained from Piper betle.