'revealable' originates from modern English, formed by combining the verb 'reveal' with the suffix '-able' (from Latin '-abilis'), where '-able' meant 'able to be'.

'reveal' came into English via Middle English from Old French 'reveler' and ultimately from Latin 'revelare' (re- + velare 'to veil'), and the adjective was formed later by adding English '-able' to produce 'revealable'.

Originally from Latin 'revelare' meaning 'to uncover' or 'remove a veil', the sense evolved into 'make known' in English; adding '-able' yields the current meaning 'able to be revealed' (capable of being made known).