(g)wīˈülē noun
or hua·yu·le wī-
( -s )
Etymology: American Spanish, from Nahuatl cuauhuli, literally, tree gum, from cuahuitl tree + uli gum
1. : a much-branched subshrub ( Parthenium argentatum ) with slender silvery leaves and small white flowers that is native to dry parts of Mexico and the adjacent southwestern United States and has been cultivated as a source of rubber
2. or guayule rubber : rubber obtained from guayule