Added 10 October 2026 microtubule noun Categories: The BodyRare Words noun ! Definition from Wiktionary (CC BY-SA). More about microtubule at Wordnik → Where our words come from → A small tube made of protein and found in cells; part of the cytoskeleton. Related Words: organizingassociatednanotubulemacrotubulemicrotuberclemicrotentaclemicrotubemicrotainermicrotethermicroglobulemicrobodymicrotubing Back to today's word