Laughter

The Student's Medical Dictionary · 1896 · p. 356

(lahfing, lahffter) [AS., hlehhan, to laugh]. A succe ion of rhythmic, spasmodic expirations with open glottis and vibration of the vocal bands, and indicating mirth. L.-gas, nitrous oxid, or protoxid of nitrogen. See Nitrous Oxid and Anesthetics. 356