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水糸 (みずいと) — leveling line (establishing horizontality during construction); level string line; leveling string
水糸
leveling line (establishing horizontality during construction)
糸 「いと」「し」
thread; yarn; string
中糸 ちゅういと
medium-sized thread
糸頭 いとがしら
top component of the kanji "thread" radical
色糸 いろいと
colored thread; coloured thread
糸道 いとみち
groove in a shamisen player's fingernail caused by the friction of the string of the instrument