孝子芋

孝(こう)子(こ)芋(いも) • (kōkoimo) 

1. alternative form of 孝行芋 (kōkōimo, “(Tsushima) sweet potato”)
   • [c. 1840, 성해응(成海應) [seonghaeeung], 硏經齋全集‎^[1], volume 14, 藷說 [2]:

     英廟癸未。先君子入日本。李七灘匡呂書托種藷法。至對馬島佐須浦始得之。卽所稱孝子芋也。古有孝子種之養親故名。 [Korean Literary Sinitic, trad.]

     Yeongmyo gyemi. Seon'gunja ip Ilbon. I-Chiltan-Gwangryeo seotak jong-jeo-beop. Ji Daema-do Sasu-po si deuk ji. Jeuk soching hjoya-u ya. Go yu hyoja jong ji yangchin go myeong. [Sino-Korean]

     1763. My deceased father had gone to Japan; Lee Chiltan Kwangryo sent a letter on the cultivation of potatoes; at Sasuna on Tsushima island he first attained this; namely, what is called the hyoja-u ("potato of the filial son"). There was a filial son who cultivated it to raise his parents, hence its name.

   • [(Can we date this quote?), 海槎日記; quoted in 小倉進平, “對馬方言と朝鮮語との交渉”, in 南部朝鮮の方言, 朝鮮史學會, 1924:

     島中有草根可食者、名曰甘藷。或謂孝子麻倭音古貴爲麻。 [Korean Literary Sinitic, trad.]

     Dojung u chogeun ga sik ja, myeong wol gamjeo. Hogwi hyojama waeeum gogwiuima. [Sino-Korean]

     [1764.] The island has an edible root called the gamjeo. It is also called the hyojama, or pronounced in Japanese, gogwiuima.