This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 葤 is uncertain. It combines the grass radical 艹 with 紂, but the original meaning and component function are unclear.
The top 艹 suggests a plant, and the bottom 紂 contains thread-like elements. Picture a plant wrapped in thread, but its meaning remains unclear.
For チュウ, imagine a rare plant named 'Chuu' wrapped in thread: Chuu -> チュウ, though the plant's purpose is unknown.