a small vein.
one of the branches of a vein in the wing of an insect.
Also, veinule, veinulet.

1840–50; < Latin vēnula little vein. See vein, -ule

venular, adjective
intervenular, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
venule (ˈvɛnjuːl)
1.  anatomy any of the small branches of a vein that receives oxygen-depleted blood from the capillaries and returns it to the heart via the venous system
2.  any of the branches of a vein in an insect's wing
[C19: from Latin vēnula diminutive of vēnavein]

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

venule ven·ule (věn'yōōl, vēn'-)
A small vein, especially one joining capillaries to larger veins. Also called capillary vein.

ven'u·lar (-yə-lər) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
venule   (věn'yl)  Pronunciation Key 
Any of the smaller veins that connect the capillaries to larger veins.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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