'pro-Gnostic' is formed from the prefix 'pro-' (from Latin 'pro', meaning 'for' or 'in favor of') combined with 'Gnostic' (from Greek 'gnōstikos', relating to knowledge).

'Gnostic' comes from Greek 'gnōstikos' (from 'gnōsis' meaning 'knowledge'), passed into Late Latin as 'gnosticus' and then into English; the prefix 'pro-' (Latin) is commonly attached in modern English to indicate support, producing 'pro-Gnostic'.

Originally 'gnōstikos' meant 'relating to knowledge'; over time 'Gnostic' became associated with the religious movement Gnosticism, and 'pro-Gnostic' now means 'in favor of or supportive of Gnosticism'.