an aged woodland deity, one of the sileni, who was entrusted with the education of Dionysus. He is depicted either as dignified and musical, or as an old drunkard.
(as noun silenus) (plural sileni /-nʌɪ/) a woodland spirit, usually depicted in art as old and having ears like those of a horse.
Silenus in other Oxford dictionaries
Definition of Silenus in the US English dictionary