From Wiktionary, the free dictionary
Inherited from Old French sorastre.
- IPA(key): /sœ.ʁatʁ/ ~ /sœ.ʁɑtʁ/
sœurâtre f (plural sœurâtres, masculine frèrâtre)
- (dated) stepsister (especially an evil one)
- Synonyms: sorâtre, quasi-sœur
- (by extension) bad or uncaring sister