Any of various aquatic plants of the genus Alisma, having narrow to ovate leaves and branched panicles with whorls of small flowers.
[From PLANTAIN1, because the leaves of the water plaintain resemble those of plants of the genus Plantago (the name water plantain perhaps originating as a translation of New Latin plantāgō aquātica : plantāgō, plantain + aquātica, aquatic).]
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