'Step-' definitions:

Definition of 'Step-'

From: GCIDE
  • Step- \Step-\ [AS. ste['o]p-; akin to OFries. stiap-, stiep-, D. & G. stief-, OHG. stiuf-, Icel. stj?p-, Sw. styf-, and to AS. [=a]st[=e]pan, [=a]ste['o]pan, to deprive, bereave, as children of their parents, OHG. stiufen.] A prefix used before father, mother, brother, sister, son, daughter, child, etc., to indicate that the person thus spoken of is not a blood relative, but is a relative by the marriage of a parent; as, a stepmother to X is the wife of the father of X, married by him after the death of the mother of X. See Stepchild, Stepdaughter, Stepson, etc. [1913 Webster]