Obs. rare–1. [ad. Gr. type *θῡμομαντεία, f. θῡμόμαντις prophesying from one’s own soul, f. θῡμός soul, spirit: see -MANCY.] Divination by one’s own soul: see quot., and cf. PSYCHOMANCY 1.
1651. Hobbes, Leviath., I. xii. 56. Sometimes in their own hopes and feares, called Thumomancy, or Presage.
