A microscopic hairlike process extending from the surface of a cell or unicellular organism.Capable of rhythmical motion, it acts in unison with other such structures to bring about the movement of the cell or of the surrounding medium.

• 细胞的颤毛突起细胞或单细胞生物表面上伸出的微小毛状突起。可有节律地运动，与其他结构协调运动产生细胞或其周围媒介物的移动