ヲタ
Ainu『藻汐草』：「砂」。ota は砂浜にも用いる。
otamedium
Both dictionaries directly attest ota for sand. The separate pouring verb ota and other homonyms are irrelevant to 砂. The existing modern form is retained.
References
Occurrences (1)
- National Institute for Japanese Language and Linguistics · 乾巻 · Page 14, line 15 · ヲタ
…谷地ヤヂ 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…