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From The Collaborative International Dictionary of English v.0.48:
Gastromancy \Gas`tro*man"cy\, n. [Gastro- + -mancy: cf. F. gastromancy.] (Antiq.) (a) A kind of divination, by means of words seemingly uttered from the stomach. (b) A species of divination, by means of glasses or other round, transparent vessels, in the center of which figures are supposed to appear by magic art. [1913 Webster]