'aestus' originates from Latin, specifically the word 'aestus', where 'aestus' meant 'heat' or 'tide'.

'aestus' has remained largely unchanged from its Latin origins, retaining its meaning related to tides and surges.

Initially, it meant 'heat' or 'tide', but over time it evolved to focus more on the concept of a swelling or boiling motion, particularly of the sea.