[too-byool, tyoo-]
a small tube; a minute tubular structure.

1670–80; < Latin tubulus, equivalent to tub(us) pipe + -ulus -ule

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World English Dictionary
tubule (ˈtjuːbjuːl)
any small tubular structure, esp one in an animal, as in the kidney, testis, etc
[C17: from Latin tubulus a little tube]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

tubule tu·bule (tōō'byōōl, tyōō'-)
A very small tube or tubular structure; tubulus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Red blood cell casts are a sign of bleeding into the kidney tubule.
Some inheritable mutations cause gradual damage to the cells that work on the tubule side of the glomerular filtration membrane.
Within a few years, he had figured out how to coax these cells to form mature tubule structures in the lab.
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