'alismoid' originates from the Latin word 'Alisma', referring to a genus of aquatic plants, combined with the suffix '-oid', meaning 'resembling or like'.

The term 'alismoid' was derived from the Latin 'Alisma', which was used in botanical contexts to describe plants similar to those in the Alisma genus.

Initially, it meant 'resembling Alisma', and this meaning has largely remained the same in modern usage.