Lewis Short
ē-marcesco, -marcui, 3
* V. inch. n., to wither away (very rare).—Trop., to dwindle away, disappear: auctoritas,Plin. 15, 29, 36, § 121: refugium,Hier. Ies. 5, 17, 4: cor meum,fainted,Vulg. Isa. 21, 4 al.† † emarcus, i a Gallic word, a kind of vine, producing a wine of middling quality, Col. 3, 2, 25 (called also marcus, Plin. 14, 2, 4, § 32).
Charlton T. Lewis, Charles Short, A Latin Dictionary