This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
葇 combines the grass radical 艹 with 柔, but the exact historical development and original meaning are uncertain.
The top grass 艹 over 柔 (soft, gentle) suggests a soft plant or herb, but no specific meaning is established.
For ジュウ, imagine a soft, gentle plant that you gently 'ju' (like the start of 'juice') squeeze to release its soothing essence: ju -> ジュウ.
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