- A prefix used before father, mother, brother, sister, son, daughter, child, and so forth, to indicate that the person being identified is not a blood relative but is related through the marriage of a parent. See stepfather, stepmother, stepbrother, stepsister, stepson, stepdaughter, and stepchild.
Etymology: Anglo Saxon steóp-; akin to Old Friesian stiap-, stiep-, Dutch and German stief-, Old High German stiuf-, Icelandic stjp-, Swedish styf-, and to Anglo Saxon ÄstÄpan, Ästeópan, to deprive, bereave, as children of their parents, Old High German stiufen
- Dutch: stief- (e.g. stiefdochter, stiefmoeder, stiefvader, stiefzoon)
- French: beau-, bel-, belle-
- Spanish: -astro , -astra
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