Obs. = ALGEBRA; being the second half of the Arabic name of the science. (Also in med.L. almacabala: see ALGEBRA.)
1570. Dee, Math. Præf., 6. The Science of workyng Algiebar and Almachabel, that is, the Science of findyng an vnknowen number, by Addyng of a Number, and Diuision and æquation.
