'acronycally' originates from Greek, specifically the word 'akronux,' where 'akro-' meant 'highest' and 'nux' meant 'night.'

'akronux' transformed into the Latin word 'acronychus,' and eventually became the modern English word 'acronycal' through Middle English.

Initially, it meant 'related to the highest point of night,' but over time it evolved into its current meaning of 'occurring at sunset or dusk.'