An Etymological Dictionary of Astronomy and Astrophysics

The phenomenon exhibited by a body (especially a ferromagnetic or imperfectly elastic material) in reacting to changes in the forces, especially magnetic forces, affecting it.

In ferromagnetic materials, the lag in the change in the magnetic induction B behind the change in the intensity of the external magnetizing field, due to the dependence of B on its previous values (past history).

Etymology (EN): Hysteresis, from Gk. hysteresis “being behind or late,” from
hystere-, stem of hysterein “to come late, lag behind” + -sis a suffix forming abstract nouns of action.

Etymology (PE): Pasmând “lagging behind,” from pas “behind” (Mid.Pers. pas “behind, before, after;” O.Pers. pasā “after;” Av. pasca “behind (of space); then, afterward (of time);” cf. Skt. pazca “behind, after, later,”
L. post “behind, in the rear; after, afterward;” O.C.S. po “behind, after;” Lith. pas “at, by;”
PIE *pos-, *posko-) + mând stem of mândan “to remain; to be fatigued,” mân “house, family” (Mid.pers. mândan “to remain, stay;” O.Pers. mān- “to remain, dwell;” Av. man- “to remain, dwell; to wait;” cf. Gk. menein “to remain;” L. manere “to stay, remain, abide,” mansio “a staying, a remaining, night quarters, station” (Fr. maison, ménage; E. manor, mansion, permanent); PIE *men- “to remain, wait for.”