pertaining to or occurring in or as if in a tube of fine bore.
resembling a strand of hair; hairlike.
pertaining to capillarity.
of or pertaining to the apparent attraction or repulsion between a liquid and a solid, observed in capillarity.
Anatomy. pertaining to a capillary or capillaries.
noun, plural capillaries.
Anatomy. one of the minute blood vessels between the terminations of the arteries and the beginnings of the veins.
Also called capillary tube. a tube with a small bore.

1570–80; capill(ar) (obsolete, < Latin capillāris pertaining to hair, equivalent to capill(us) hair + -āris -ar1) + -ary

intercapillary, adjective
noncapillary, adjective, noun, plural noncapillaries. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
capillary (kəˈpɪlərɪ)
1.  resembling a hair; slender
2.  (of tubes) having a fine bore
3.  anatomy of or relating to any of the delicate thin-walled blood vessels that form an interconnecting network between the arterioles and the venules
4.  physics of or relating to capillarity
n , -laries
5.  anatomy any of the capillary blood vessels
6.  a fine hole or narrow passage in any substance
[C17: from Latin capillāris, from capillus hair]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1656, from L. capillaris "of hair," from capillus "hair" (of the head). Capillarity is recorded from 1830.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

capillary cap·il·lary (kāp'ə-lěr'ē)

  1. Of or relating to the capillaries.

  2. Relating to or resembling a hair; fine and slender.

Blood capillary.
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
capillary   (kāp'ə-lěr'ē)  Pronunciation Key 
Any of the tiny blood vessels that connect the smallest arteries (arterioles) to the smallest veins (venules). Capillaries form a network throughout the body for the exchange of oxygen, metabolic waste products, and carbon dioxide between blood and tissue cells.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
capillary [(kap-uh-ler-ee)]

A thin tube, such as a blood vessel or a straw, through which fluids flow.

Note: The interaction between the fluid and the vessel walls produces a force that can lift the fluid up into the tube, a phenomenon known as capillary action.
capillaries [(kap-uh-ler-eez)]

The tiny blood vessels throughout the body that connect arteries and veins. Capillaries form an intricate network around body tissues in order to distribute oxygen and nutrients to the cells and remove waste substances. (See circulatory system.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The doctor may find changes in capillaries that are characteristic of
  scleroderma or mixed connective tissue disease.
It gets its name because it attacks the blood capillaries that feed a tumour.
She drills through the epidermis, then through a thin layer of fat, then into
  the network of blood-filled micro capillaries.
In addition, each cell is in contact with a number of capillaries.
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