一いち眠みんMeanings1nounfirst sleep of silkwormsSpecialized term used in sericulture (silkworm farming) for the first molting sleep of silkworms.蚕かいこの一いち眠みんが始はじまると、しばらく餌えさをやらなくてよい。When the silkworms' first sleep begins, you don't need to feed them for a while.