An ester of carbamic acid
A white crystalline substance, 
Noun
 an ester of carbamic acid
n.
 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.
Urethane
A white crystalline substance, 
Usage Examples
Urethane, Urethane, rethane, Urethane, Uerethane, U4rethane, U5rethane, Utrethane, Ufrethane, Ueethane, U4ethane, U5ethane, Utethane, Ufethane, Ureethane, Ur4ethane, Ur5ethane, Urtethane, Urfethane, Urwethane, Ur3ethane, Ur4ethane, Urrethane, Ursethane, Urdethane, Urwthane, Ur3thane, Ur4thane, Urrthane, Ursthane, Urdthane, Urewthane, Ure3thane, Ure4thane, Urerthane, Uresthane, Uredthane, Urerthane, Ure5thane, Ure6thane, Ureythane, Uregthane, Urerhane, Ure5hane, Ure6hane, Ureyhane, Ureghane, Uretrhane, Uret5hane, Uret6hane, Uretyhane, Uretghane, Uretghane, Uretyhane, Uretuhane, Uretjhane, Uretnhane, Uretgane, Uretyane, Uretuane, Uretjane, Uretnane, Urethgane, Urethyane, Urethuane, Urethjane, Urethnane, Urethqane, Urethwane, Urethsane, Urethzane, Urethqne, Urethwne, Urethsne, Urethzne, Urethaqne, Urethawne, Urethasne, Urethazne, Urethabne, Urethahne, Urethajne, Urethamne, Uretha ne, Urethabe, Urethahe, Urethaje, Urethame, Uretha e, Urethanbe, Urethanhe, Urethanje, Urethanme, Urethan e, Urethanwe, Urethan3e, Urethan4e, Urethanre, Urethanse, Urethande, Urethanw, Urethan3, Urethan4, Urethanr, Urethans, Urethand, Urethanew, Urethane3, Urethane4, Urethaner, Urethanes, Urethaned.