This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
檑 combines 木 (tree/wood) with 雷 (thunder). The exact historical development and original meaning are uncertain.
With 木 on the left and 雷 on the right, picture a wooden object struck by thunder, but its meaning remains unclear.
For ライ, imagine a bolt of lightning (雷) striking a tree (木) with a loud 'rye' sound: rye -> ライ.
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