A-lās', interj.

[O. Fr. hailas, halas, ha las, alas, N. Fr. hélas, Pr. ailas, f. ai lassa, It. ahi lasso, fem. ahi lassa, from Fr. & Pr. las, Sp. laso, It. lasso, weary, unfortunate, from Lat. lassus, weary, languid.] An exclamation expressive of sorrow, grief, pity, concern, or apprehension of evil;—in old writers, sometimes followed by day or while; alas the day, like alack a day, or alas the while. [Obs.]