'pollenless' originates from Modern English, formed from the noun 'pollen' (from Latin 'pollen', meaning 'fine flour') plus the suffix '-less' (from Old English 'lēas', meaning 'without').

'pollen' came into English via Medieval/Scientific Latin from Latin 'pollen'; the suffix '-lēas' in Old English developed into Middle English '-les' and then the modern English suffix '-less', producing compounds like 'pollenless'.

Initially it meant literally 'without pollen' and this literal meaning has been retained in modern usage.