Meaning

noun a spirit that lives in or frequents the woods

adjective relating to or characteristic of wooded regions

originBorrowed from Medieval Latin sylvanus, possibly via Middle French sylvain, from Latin silvanus, cognate with Latin Silvānus (“Roman god of the woods”), from silva (“forest”), from Proto-Indo-European *sel-, *swel- (“beam, board, frame, threshold”). The ⟨y⟩ in sylvanus and its descendants is due to influence from Ancient Greek ῡ̔́λη (hū́lē, “wood, matter”), transliterated in the Latin style as…

Etymology from Wiktionary, CC BY-SA 3.0