The Collaborative International Dictionary
Geloscopy
Geloscopy \Ge*los"copy\, n. [Gr. ? to laugh + -scopy.] Divination by means of laughter.
Douglas Harper's Etymology Dictionary
geloscopy
"divination of a person's qualities or character by laughter," 1730s, from Greek gelos "laughter" + -oscopy (see -scope).
Wiktionary
geloscopy
n. (context rare English) divination by means of laughter.