Pronunciation (UK) IPA (key): /ˈpɛtɪəʊl/ (US) IPA (key): /ˈpɛdiˌoʊl/ Audio (UK)(file) Noun Singular petiole Plural petioles (countable) (botany) The petiole of a plant is the stalk that connects a leaf to the stem.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads