Silenus

or Si·le·nos, Sei·le·nos

[ sahy-lee-nuh s ]
/ saɪˈli nəs /

noun, plural Si·le·ni [sahy-lee-nahy] /saɪˈli naɪ/ for 2. Classical Mythology.

a forest spirit, sometimes referred to as the oldest of the satyrs and the foster father, teacher, and companion of Dionysus: often represented as a bearded old man.
(lowercase) any of a group of forest spirits similar to satyrs: often represented as a drunken old man with the legs and ears of a horse.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for sileni

Silenus
/ (saɪˈliːnəs) /

noun Greek myth

chief of the satyrs and foster father to Dionysus: often depicted riding drunkenly on a donkey
plural Sileni (saɪˈliːnəɪ) (often not capital) one of a class of woodland deities, closely similar to the satyrs
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012