1. a. A widely cultivated evergreen climbing plant (Hedera helix) native to Eurasia, having palmately lobed leaves, root-bearing young stems, small green flowers grouped in umbels, and blackish or yellowish berries. Also called English ivy.
b. Any of several other woody, climbing or trailing evergreen plants of the genus Hedera of the Northern Hemisphere.
2. a. Any of various creeping or trailing plants of other genera, such as Boston ivy, ground ivy, or Virginia creeper.
b. Poison ivy.