Läugh'ter, n.

(läf'ter), n. [A.S. hleahtor, O. H. Ger. hluhtār, M. H. Ger. lahter, gelehter, N. H. Ger. gelächter, Icel. hlátr, Dan. latter.] An involuntary movement of the muscles of the face, particularly of the lips, or a peculiar expression of the eyes, indicating merriment or satisfaction, and usually attended by a sonorous and interrupted expulsion of air from the lungs.

Archly the maiden did smile, and with eyes overrunning with laughter. Longfellow.