water yam; winged yam; purple yam
Refers to the plant Dioscorea alata, a type of yam. The term is rare and usually written in kana.
See also: ダイジョ
Shinsho is a type of yam cultivated in tropical regions.
Kanji form is rare; usually written in kana.
The origin is uncertain; the kanji 参薯 are used for this plant, but the word is usually written in kana.