原核细胞的鞭状延长部分，基部有基体，当鞭毛进行挥鞭式运动时可以促使细胞移动。

Flagellum (pl. flagella) A whiplike extension of prokaryote cells, with a basal body at its base, whose beat causes locomotion of the cell.

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鞭毛摆动迟缓或停止运动。

Movement of the flagella became slow or stopped.

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许多原生动物利用伪足、纤毛或鞭毛能运动。

Many protoctistans are motile, using pseudopodia, cilia or flagella.

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