1852 Watts tr. Gmelin'sHandbk. Chem. VII. 377It is resolved into alcohol and a *ureo-carbonate of the alkali. 
Ibid. ,The constituents of vinic ether and of hypothetically anhydrous *ureo-carbonic acid. 
1876 J. G. Blackley in Jrnl. Chem. Soc. II. 467A modification of Russell and West's *ureometer. 
1884 Knight Dict. Mech. Suppl. 915/1In Hüfner's new ureometer,..the exact methods for the determination of urea in organic liquids are..complex and tedious. 
1901 Lancet 9 March 697/1, I have examined the urine with Martindale's ureometer. 
1876 J. G. Blackley in Jrnl. Chem. Soc. II. 447The operation of *ureometry. 
ureo-
— see ure-
— see ure-