A / antĕcursor
noun

antĕcursor

gen. antĕcursōris · gender masculine · decl. 3rd
he that runs before;
he that runs before; hence,
In milit. lang.: antecursores, the forerunners of the army, the advanced guard,…
In milit. lang.: antecursores, the forerunners of the army, the advanced guard, precursors, pioneers, Caes. B. G. 5, 47; id. B. C. 1, 16; 3, 36; so Vulg. Sap. 12, 8.—
the forerunner
In Tert. John the Baptist is so named, as the forerunner of Christ, Tert. adv. Marc. 4, 33.