U*reth"ane (?), n. (Chem.) A white crystalline substance, NH₂.CO.OC₂H₅, produced by the action of ammonia on ethyl carbonate. It is used somewhat in medicine as a hypnotic. By extension, any one of the series of related substances of which urethane proper is the type.

U*reth"ane (?), n. [F. uréthane. See Urea; Ether.] (Org. Chem.) A white crystalline substance, NH₂.COOC₂H₅, produced by the action of ammonia on ethyl carbonate or by heating urea nitrate and ethyl alcohol. It is used as a hypnotic, antipyretic, and antispasmodic. Hence, any ester of carbamic acid.

U*reth"ane (?), n. (Chem.) A white crystalline substance, NH₂.CO.OC₂H₅, produced by the action of ammonia on ethyl carbonate. It is used somewhat in medicine as a hypnotic. By extension, any one of the series of related substances of which urethane proper is the type.

U*reth"ane (?), n. [F. uréthane. See Urea; Ether.] (Org. Chem.) A white crystalline substance, NH₂.COOC₂H₅, produced by the action of ammonia on ethyl carbonate or by heating urea nitrate and ethyl alcohol. It is used as a hypnotic, antipyretic, and antispasmodic. Hence, any ester of carbamic acid.

• (chemistry) a white crystalline organic compound, ethyl-carbamate, NH2COOC2H5, used in the synthesis of other organic compounds
  
• any compound of having this general structure