Webster's Revised Unabridged Dictionary · 1913

Orthocarbonic

Orthocarbonic , adjective

[Ortho- + carbonic.]

(Chemistry) Designating a complex ether, C.(OC2H5)4, which is obtained as a liquid of a pleasant ethereal odor by means of chlorpicrin, and is believed to be a derivative of the hypothetical normal carbonic acid, C.(OH)4.