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drawtube
The definition of a drawtube is a tube that slides while inside another tube.
(noun)The moving part of the focusing tool on a telescope is an example of a drawtube.
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See drawtube in Webster's New World College Dictionary
noun
a tube sliding within another tube, as in the eyepiece of a microscope
See drawtube in American Heritage Dictionary 4
noun
A tube that slides within another tube, as in a small hand telescope.
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