シヨー
Ainu「瀧」。so（滝）。
somedium
Both dictionaries explicitly identify so as a waterfall. The Japanese 瀧 supports that sense over the homonymous floor, exposed rock and grammatical words. So is retained as the modern comparison; soo tests the source’s length mark without asserting historical phonemic vowel length.
Occurrences (1)
- National Institute for Japanese Language and Linguistics · 乾巻 · Page 15, line 1 · シヨー
…ヂ ケナシカ岩山グツ゚ンネ津浪山づみヲハコベ曇るニシクリ砂ヲタ滝シヨー屋敷チセコツ平地キロシテ森トキヤ林テイグル樹の茂生ニタイ所の繁昌コタンシビ煙シブヤ暑シリポプケ冽…