A*las" (#), interj. [OE. alas, allas, OF. alas, F. h'elas; a interj. (L. ah.) + las wretched (that I am), L. lassus weary, akin to E. late. See Late.]
An exclamation expressive of sorrow, pity, or apprehension of evil; -- in old writers, sometimes followed by day or white; alas the day, like alack a day, or alas the white.
© Webster 1913.