1. grain; bead; dropOnly applies to つぶ, Only applies to つび, Only applies to つぼ
2. counter for small round objects including grains, seeds, pills, drops
粒 【りゅう】、粒 【つび】、粒 【つぼ】
つび: Out-dated or obsolete kana usage. つぼ: Out-dated or obsolete kana usage.
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