"Unifilar" . From "uni-", one and "-filar" from the Latin filum, thread. 1 . Electricity. Conductor wire or single-wire: it is one whose copper core is formed by a single wire. Also called rigid and used in the installation of command boards. In Argentina, its use in home installations is prohibited. 2 . Electricity. Diagram of a circuit, in which the different conductors of a section are represented in a single line or stroke.