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出典:Wiktionary
From Middle English [Term?], from 古期英語 reġnwyrm, from Proto-Germanic [Term?]. Analysable as rain + worm, because the worm has the habit of surfacing on top of the saturated soil after rainfall. Cognate with Dutch regenworm, Old High German reganwurm, whence German Regenwurm.
rainworm (複数形 rainworms)
rainworm