• Bengali Word সৎ ২ English definition (adjective) (used as a prefix) 1 related through another wife of one’s husband or through another husband of one’s wife; step: সৎছেলে. 2 having one parent in common; half: সৎবোন. 3 related by another marriage; step. সৎছেলে, সৎবেটা (noun) step-son. সৎ বাপ (noun) step-father. সৎবোন (noun) half-sister; step-sister. সৎভাই (noun)1 half-brother; step-brother. সৎমা (noun) step-mother. সৎমেয়ে (noun) step-daughter. সৎশাশুড়ি (noun) step-mother-in-law.