gruel, milk and water, Irish eanghlais, Early Irish englas (fem. a stem), milk and water, green water ( Corm.), from in and Middle Irish glas, milk, *glagsa; Greek $$Gglágos, $$Ggála(ktos), milk, Latin lac (= *glak-t). Cormac says it is from en, water, and glas, grey. en = water, *pino ( St.).
Etymological dictionary of the Gaelic language.
Alexander Gairm Publications.
1982.