draw-tube

drawtube

[draw-toob, -tyoob]
noun
a tube sliding within another tube, as the tube carrying the eyepiece in a microscope.

Origin:
1890–95; draw + tube

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World English Dictionary
drawtube (ˈdrɔːˌtjuːb)
 
n
a tube, such as one of the component tubes of a telescope, fitting coaxially within another tube through which it can slide

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