ceˈruleo-combining form of L. cærule-us, in the names of various chemical compounds, as ceruleo-sulphuric acid; ceruleo-lactin, etc.1810Henry Elem.Chem. (1840) II. 281 Ceruleo-sulphate of Potassa.1838Ceruleo-sulphate [see cerulein].1875Ure Dict. Arts II. 906 s.v.Indigo, A peculiar acid, to which the names of indigo-sulphuric, sulphindigotic, sulphindylic, or cæruleo-sulphuric acid have been applied [Watts (III. 258) calls this Sulphocærulic acid].1879Watts Dict.Chem., 2nd Supp. 276 Ceruleolactin, a hydrated aluminium phosphate..found in botryoïdal and reniform masses.b.ceruleo-nasal: humorous for blue-nose 2.1858O. W. Holmes De Sauty, Tell me, O Provincial; speak, Ceruleo-nasal.