慈姑

Etymology
Concerning the name of the plant,  says:

Noun

 * 1)  husband's mother; mother-in-law
 * 2) arrowhead
 * 3)  water chestnut

Synonyms




Etymology
. One theory suggests that this is an alteration from (kawa imo, “river tuber”), but the old kana spelling of  for 慈姑 does not match the old kana spelling of  for. This is more likely a compound of, from the shape of the leaves, plus an unknown element ゐ (wi).

The kanji are an name for this plant.

Noun

 * 1) arrowhead,  var. edulis, cultivated since ancient times for its edible bulb