arboreal adj. + Add to list US //ɑɹˈbɔɹiəɫ// UK //ˈɑːbɔːɹˌiəl// ar·bo·re·al SynonymsEtymology Synonyms arboraryarboreousarborescentarboresquearboricalarboriformarborousdendriformdendroidtree livingOrigin From Latin arboreus (“tree-like”) + -al, mid-17th century.