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1. A perennial aroid plant (Amorphophallus konjac) of East and Southeast Asia having a single large compound leaf, a purple or dark red spathe, and starchy corms.
2. The edible corm of this plant or the starch derived from it, sometimes used as a dietary supplement. In both senses also called devil's tongue, konnyaku.

[Ultimately from Japanese konnyaku, from Early Middle Chinese kuə̆' ŋı̷ak : kuə̆', betel leaf (also the source of Mandarin ) + ŋı̷ak, rush used to make mats (also the source of Mandarin ruò).]
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