蝦夷方言藻汐草

The companion transcription lists otauni under 砂岸; Hirayama repeats the source entry without a modern equivalent. ota independently means sand, but these records do not establish the complete expression’s phonology or the ending ウニ. The published otawni was mechanically converted from otauni. Retain it provisionally at low confidence, comparing the unconverted form and a possible ota un i division. That division is a morphological guess and supplies no verified shore expression. All three corpus queries return zero.