From a Tai language; compare Proto-Tai *luəkᴰ (“to scald”) (whence Thai ลวก (lûuak)). Compare also Cantonese 淥 / 渌 (luk6, “to boil; to scald”), which represents a Tai substrate.
luộc • (灟, 爥, 𤊒, 𤐠)