Definition of "satyr"

(Greek mythology) A sylvan deity or demigod, male companion of Pan or Dionysus, represented as part man and part goat, and characterized by riotous merriment and lasciviousness, sometimes pictured with a perpetual erection.  quotations

(Roman mythology) Synonym of faun

(by extension) A lecherous man.  examples

Any of various butterflies of the nymphalid subfamily Satyrinae, having brown wings marked with eyelike spots; a meadow brown.  examples

(obsolete) The orangutan.