Anatomy. any of the smallest branches of an artery, terminating in capillaries.

1830–40; < Neo-Latin artēriola, equivalent to Latin artēri(a) artery + -ola -ole1

arteriolar, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arteriole (ɑːˈtɪərɪˌəʊl)
anatomy any of the small subdivisions of an artery that form thin-walled vessels ending in capillaries
[C19: from New Latin arteriola, from Latin artēriaartery]

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Word Origin & History

"small artery," c.1840, from Mod.L. arteriola, dim. of arteria (see artery).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

arteriole ar·te·ri·ole (är-tǐr'ē-ōl')
A minute artery, especially a terminal artery continuous with the capillary network.

ar·te'ri·o'lar (-ō'lər, -ə-lər) adj.
The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
arteriole   (är-tîr'ē-ōl')  Pronunciation Key 
Any of the smaller branches of an artery, especially one that connects with a capillary.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The blood flows into smaller and smaller branches of arteries called arterioles.
Once in circulation, the crystals get stuck in tiny blood vessels called arterioles.
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