guiding
• (n.) The line of motion along which a describent line or surface is carried in the genesis of any plane or solid figure; a directrix. • (a.) Directing.
Dir'i·gent adjective [ Latin dirigens , present participle of dirigere . See Direct , adjective ] Directing. Baxter. Dir'i·gent noun (Geom.) The line of motion along which a describent line or surface is carried in the genesis of any plane or solid figure; a directrix. Hutton.