From Wiktionary, the free dictionary
From વિ- (vi-) + ધર્મ (dharma). Not, as may be supposed, from Sanskrit વિધર્મ (vidharma, “unjust, unlawful, devoid of qualities”).
વિધર્મ • (vidharma) m
- a different or opposing religion (than of the subject)
- Synonym: પરધર્મ (pardharma)
