
• A kind of plant with acrid leaves. See under 2d Plantain.
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http://thinkexist.com/dictionary/meaning/water_plantain/

any freshwater perennial herb of the genus Alisma, commonly found in lakes, ponds, and ditches. The three or four species are widely distributed ... [1 related articles]
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http://www.britannica.com/eb/a-z/w/14

(Alisma) This is a group of hardy aquatic plants. The most popular is A. plantago-aquatica, the Water Plantain. This plant grows 2 or 3 feet high and flourishes in shallow water, though it will grow in water up to 18 inches deep. It produces rosettes of long-stalked, rounded to heart-shaped leaves. In June and July, panicles of pinkish-white flower...
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http://www.encyclo.co.uk/local/10004
Wa'ter plan'tain (Botany) A kind of plant with acrid leaves. See under 2d
Plantain .
Found on
http://www.encyclo.co.uk/webster/W/14

Water-Plantain (Alisma) is a name for several species of the family Alismaceae, aquatic and sometimes floating, with long-stalked, often large leaves.
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http://www.probertencyclopaedia.com/browse/BW.HTM

[
n] - marsh plant having clusters of small white or pinkish flowers and broad pointed or rounded leaves
Found on
http://www.webdictionary.co.uk/definition.php?query=water%20plantain
Alisma plantago-aquatica noun marsh plant having clusters of small white or pinkish flowers and broad pointed or rounded leaves
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.