资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.