• quadratic differential form

द्वि:    double acting double helical gear double

द्वि घात:    quadric द्वि double acting double helical

द्वि घात अवकल:    quadratic differential द्वि double acting

घात:    ambuscade ambush machination manoeuvre trap

अवकल:    differential

अवकल समघात:    differential form अवकल differential

समघात:    homogeneous