'interdictor' originates from Latin, specifically the verb 'interdicere' meaning 'to forbid' (inter- 'between/against' + dicere 'to say').

'interdictor' developed via Medieval Latin/Church Latin forms (e.g. Medieval Latin 'interdictor') and entered English usage as an agent noun formed from 'interdict'.

Initially it meant 'one who forbids or prohibits,' and this core meaning has largely been retained in modern usage, though its use is now rare and often specialized (legal or ecclesiastical).