'arousable' originates from English, specifically from the base verb 'arouse' combined with the adjective-forming suffix '-able', where 'arouse' comes from Middle English 'arousen' (from Old French 'arousser') meaning 'to awaken' and '-able' meant 'able to be'.

'arousable' developed from Middle English 'arousen' -> Modern English 'arouse'; the adjective form arose by adding the productive suffix '-able' to form 'arousable' in Modern English.

Initially, the root meant 'to awaken' or 'to rouse'; over time the derived adjective came to mean 'able to be aroused' or 'capable of being stimulated'.