îⁿ-kō-kō圓膏膏

perfectly round

perfectly round; round as a ball

ideophonic

English Wiktionary, “圓膏膏” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E5%9C%93%E8%86%8F%E8%86%8F · confidence: Medium (Wiktionary)