† heliˈcosophyObs. [f.helico-, comb. form of Gr. ἕλιξ helix, after philosophy.] That part of geometry which treats of spirals. 1570Dee Math.Pref. 34 Helicosophie, is nere Sister to Trochilike.1696Phillips, Helicosophy, a mathematical Art which demonstrates the designing of all spiral Lines.