capillary

adjective cap·il·lary \ ˈka-pə-ˌler-ē , -ˌle-rē , British usually kə-ˈpi-lə-rē \

Updated on: 8 Apr 2018

Definition of capillary

1 a : resembling a hair especially in slender elongated form

capillary leaves

b : having a very small bore

a capillary tube

2 : involving, held by, or resulting from surface tension

capillary water in the soil

3 : of or relating to capillaries or capillarity

See capillary defined for kids

Recent Examples of capillary from the Web

But his ability to synthe-size across disparate fields also has proved a strength, enabling him to trace how energy courses through every capillary of the world's economy.

— paul voosen, Science | AAAS, "Meet Vaclav Smil, the man who has quietly shaped how the world thinks about energy," 21 Mar. 2018
From 2014 to the early parts of 2017, this is what happened when parents across America took their children to get lead tests: Often, the first test was a finger stick, known as a capillary test, and parents left with results in hand.

— hannah sparling, Cincinnati.com, "Lead tests for 'millions of kids’ may be wrong?," 10 Jan. 2018
The page stated the boy was fighting a severe case of arteriovenous malformation, an abnormal connection between arteries and veins that bypasses the capillary system.

— chris harris, PEOPLE.com, "Texas Mom Allegedly Subjected Her Healthy Son, 8, to 323 Doctor Visits and 13 Surgeries," 14 Dec. 2017
This obstruction is referred to as capillary nonperfusion, or macular ischemia.

— heather napolitano, Philly.com, "Struggling with vision loss, she finds new purpose in Philly's Foundation Fighting Blindness," 29 Sep. 2017
The finger stick or a heel stick, known as a capillary test, is the immediate go-to option for doctors.

— jennifer larino, NOLA.com, "Has your child been exposed to lead? When to get them tested," 27 July 2017
Capillary electrophoresis has been used since the 1980s, but the new test made some important changes that optimize the process to search for alien life.

— jay bennett, Popular Mechanics, "JPL Invents a Better Way to Test for Alien Life," 27 Jan. 2017
F.D.A. officials estimate that eight million tests have been run using the Magellan system since 2014, but said the majority were done using capillary blood, not blood drawn from the vein.

— roni caryn rabin, New York Times, "F.D.A. Warns of Faulty Lead Testing in Children and Mothers," 17 May 2017
Einstein was siding with younger, more radical physicists who believed that capillary action was just one of many phenomena that could be explained by the way atoms and molecules interact.

— National Geographic, "4 Everyday Items Einstein Helped Create," 13 June 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'capillary.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of capillary

French or Latin; French capillaire, from Latin capillaris, from capillus hair

NEW! Time Traveler

First Known Use: 14th century

See Words from the same year

Other Anatomy Terms

bilateral symmetry, carotid, cartilage, dorsal, entrails, prehensile, renal, solar plexus, supine, thoracic, ventral

capillary

noun

Definition of capillary

plural capillaries

1 : a minute thin-walled vessel of the body; especially : any of the smallest blood vessels connecting arterioles with venules and forming networks throughout the body

2 : a tube (as of glass) having a very small bore

See capillary defined for English-language learners

Recent Examples of capillary from the Web

The density of the smallest vessels — capillaries — became comparable to that of young mice.

— sharon begley, STAT, "A dietary supplement makes old mice youthful. But will it work in people?," 22 Mar. 2018
The device takes blood from capillaries rather than veins, takes two to three minutes and is said to be almost painless.

— lucette lagnado, WSJ, "Hospitals Fund Potential Game-Changers in Health Tech," 7 Mar. 2018
The tiny crystals become trapped in the nar- rowness of joints and capillaries and tendons, leading to the inflammation that develops into gouty arthritis.

— paul theroux, Town & Country, "A Royal Pain," 17 June 2013
These crystals — monosodium urate crystals — had lodged in the tiny capillaries of my toe joint, inflaming it.

— paul theroux, Town & Country, "A Royal Pain," 17 June 2013
Your skin has already been steamed to the max during your facial, and adding any more could lead to sensitivity and broken capillaries, Shah explains. 4.

— jenn sinrich, SELF, "8 Things You Should Never Do After a Facial," 6 Sep. 2017
Her pen strokes are blue and smooth and thin like the capillaries of maps.

— Teen Vogue, "Lit Club Winners: First Day of School," 29 Aug. 2017
Cerebral cavernous malformations (CCMs) are capillaries that are enlarged or deformed and thin-walled, making them vulnerable to leaks — which can lead to stroke or seizure.

— lacy schley, Discover Magazine, "Biological Building Blocks," 7 Aug. 2017
After being inhaled, hantaviruses lodge in the lungs and invade tiny blood vessels, called capillaries, causing them to break.

— don sweeney, sacbee, "5 things to know about hantaviruses," 21 July 2017

First Known Use of capillary

1667

Other Anatomy Terms

bilateral symmetry, carotid, cartilage, dorsal, entrails, prehensile, renal, solar plexus, supine, thoracic, ventral

CAPILLARY Defined for English Language Learners

capillary

noun

Definition of capillary for English Language Learners

: one of the many very small tubes that carry blood within the body : the smallest kind of blood vessel

CAPILLARY Defined for Kids

capillary

adjective cap·il·lary \ ˈka-pə-ˌler-ē \

Definition of capillary for Students

1 : having a long slender form and a small inner diameter

a capillary tube

2 : of or relating to capillary action or a capillary

capillary

noun

Definition of capillary for Students

plural capillaries

: one of the slender hairlike tubes that are the smallest blood vessels and connect arteries with veins

Medical Dictionary

capillary

adjective cap·il·lary \ ˈkap-ə-ˌler-ē, British usually kə-ˈpil-ə-rē \

medical Definition of capillary

1 a : resembling a hair especially in slender elongated form

b : having a very small bore

a capillary tube

2 : involving, held by, or resulting from surface tension

3 : of or relating to capillaries or capillarity

capillary

noun

medical Definition of capillary

plural capillaries

1 : a minute thin-walled vessel of the body; especially : any of the smallest blood vessels connecting arterioles with venules and forming networks throughout the body

2 : a capillary tube