
1) Tubule
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https://www.crosswordclues.com/clue/microtubule

Microtubules are a component of the cytoskeleton, found throughout the cytoplasm. These tubular polymers of tubulin can grow as long as 50 micrometres, with an average length of 25 µm, and are highly dynamic. The outer diameter of a microtubule is about 24 nm while the inner diameter is about 12 nm. They are found in eukaryotic cells and are form...
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http://en.wikipedia.org/wiki/Microtubule

tubular structure of indefinite length, constructed from globular proteins called tubulins, which are found only in eukaryotic cells. Microtubules ... [8 related articles]
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http://www.britannica.com/eb/a-z/m/86

A slender, hollow, cylindrical filament found in the cytoskeleton of animal and plant cells. Microtubules not only provide a structural network within the cell's cytoplasm but also form a substrate on which other cellular chemicals can interact, are used in intracellular transport, and are involved ...
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http://www.daviddarling.info/encyclopedia/M/microtubule.html

<cell biology> Cytoplasmic tubule, 25nm outside diameter with a 5nm thick wall. Made of tubulin heterodimers packed in a three start helix (or of 13 protofilaments looked at another way) and associated with various other proteins (MAPs, dynein, kinesin). Microtubules of the ciliary axoneme are more permanent than cytoplasmic and spindle micro...
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http://www.encyclo.co.uk/local/20973

(mi″kro-too´būl) any of the slender, tubular structures, composed chiefly of tubulin, found in the cytoplasmic ground substance of nearly all cells; they are involved in maintenance of cell shape and in the movements of organelles and inclusions, and form the spindle fibers of mitosis. ...
Found on
http://www.encyclo.co.uk/local/21001

Cytoplasmic tubule, 25nm outside diameter with a 5nm thick wall. Made of tubulin heterodimers packed in a three-start helix (or of 13 protofilaments looked at another way), and associated with various other proteins (MAPs, dynein, kinesin). Microtubules of the ciliary axoneme are more permanent than cytoplasmic and spindle microtubules.
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http://www.encyclo.co.uk/visitor-contributions.php

Type: Term Pronunciation: mī′krō-tū′byūl Definitions: 1. A hollow, cylindric cytoplasmic element, 25 nm in diameter and of variable length, that occurs widely in the cytoskeleton, cilia, and flagella of cells; microtubules play a role in the maintenance of cell shape and increase in number during mitosis and meiosis,...
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http://www.medilexicon.com/medicaldictionary.php?t=55370

[
n] - a microscopically small tubule
Found on
http://www.webdictionary.co.uk/definition.php?query=microtubule

hollow tube composed of tubulin dimers (α and β tubulin); the structural component of the cytoskeleton, centrioles, flagella, and cilia
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https://courses.lumenlearning.com/microbiology/chapter/glossary/
noun a microscopically small tubule
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https://www.encyclo.co.uk/local/20974
No exact match found.