drawtube

[draw-toob, -tyoob]

draw·tube

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

Origin:
1890–95; draw + tube
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Drawtube is always a great word to know.
So is quincunx. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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