'acalycinous' originates from Greek, specifically the word 'akaluxinos,' where 'a-' meant 'without' and 'kalyx' meant 'calyx.'

'akaluxinos' transformed into the Latin word 'acalycinus,' and eventually became the modern English word 'acalycinous.'

Initially, it meant 'without a calyx,' and this meaning has largely remained the same in modern usage.