Webster's Revised Unabridged Dictionary · 1913

Alb

Alb ({not transcribed}) , noun

[Old English albe, Late Latin alba, from Latin albus white. Compare Album and Aube.]

A vestment of white linen, reaching to the feet, an enveloping the person; -- in the Roman Catholic church, worn by those in holy orders when officiating at mass. It was formerly worn, at least by clerics, in daily life.