'acnida' originates from Greek, specifically the word 'aknidos,' where 'akni-' meant 'without' and '-dos' referred to 'gland.'

'aknidos' transformed into the Latin word 'acnida,' and eventually became the modern English word 'acnida.'

Initially, it referred to a plant without glands, but over time it evolved into its current meaning of a specific genus of plants.