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From The Collaborative International Dictionary of English v.0.48:
Orthocarbonic \Or`tho*car*bon"ic\, a. [Ortho- + carbonic.] (Chem.) 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. [1913 Webster]