Added 9 October 2026 midrib /ˈmɪdrɪb/ noun Categories: PlantsRare Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about midrib at Wordnik → Where our words come from → The vein in the center of a leaf. Related Words: leafcostaribveincoastcôtemidveinradiusveinletmicrophyllmegaphyll Back to today's word