microtubule

mi·cro·tu·bule

noun \ˌmī-krō-ˈt(y)ü-(ˌ)byü(ə)l\

Definition of MICROTUBULE

: any of the minute tubules in eukaryotic cytoplasm that are composed of the protein tubulin and form an important component of the cytoskeleton, mitotic spindle, cilia, and flagella

—mi·cro·tu·bu·lar \-byə-lər\ adjective

Illustration of MICROTUBULE