Source : Webster's Revised Unabridged Dictionary (1913)

Laticlave \Lat"i*clave\, n. [L. laticlavus, laticlavium; latus
   broad + clavus nail, a purple stripe on the tunica: cf. F.
   laticlave.] (Rom. Antiq.)
   A broad stripe of purple on the fore part of the tunic, worn
   by senators in ancient Rome as an emblem of office.