Main Entry: mi·cro·tu·bule

Pronunciation: \ˌmī-krō-ˈtü-(ˌ)byül, -ˈtyü-\

Function: noun

Date: 1961

: 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