1. Regular change or succession from one thing to another; alternation; mutual succession; interchange. God made two great lights . . . To illuminate the earth and rule the day In their vicissitude, and rule the night. Milton.

2. Irregular change; revolution; mutation. This man had, after many vicissitudes of fortune, sunk at last into abject and hopeless poverty. Macaulay.

VICISSITUDINARY
Vi*cis`si*tu"di*na*ry, a.

Defn: Subject to vicissitudes. Donne.

VICISSITUDINOUS
Vi*cis`si*tu"di*nous, a.

Defn: Full of, or subject to, changes.

VICISSY DUCK
Vi*cis"sy duck`. (Zoöl.)

Defn: A West Indian duck, sometimes domesticated.

VICKERS' GUN
Vick"ers' gun. (Ordnance)

Defn: One of a system of guns manufactured by the firm of Vickers'
Sons, at Sheffield, Eng. now included in Vickers-Maxim guns.