ptarmoscopy
The divinatory interpretation of sneezes.
rare, uncountable
He divined by Metascopy, the lines in the forehead; […] by Ptarmoscopy, sneezing; […]
Where it comes from
From Ancient Greek πταρμός (ptarmós, “sneeze”) + -scopy.
Adapted from the Wiktionary entry ptarmoscopy (CC BY-SA 4.0).