boundary layer

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noun Physics.

the portion of a fluid flowing past a body that is in the immediate vicinity of the body and that has a reduced flow due to the forces of adhesion and viscosity.

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Origin of boundary layer

First recorded in 1920–25

Words nearby boundary layer

bound, bound and determined to, boundary, Boundary Commission, boundary condition, boundary layer, boundary line, Boundary Peak, boundary rider, boundary value problem, bounded

How to use boundary layer in a sentence

From the amount of iridium found in the boundary layer, Walter Alvarez’s father Luis Alvarez, a Manhattan Project veteran and Nobel Prize-winning physicist, calculated the size of an asteroid that would be necessary to coat the globe in iridium.
The Mother of All Accidents - Issue 99: Universality|Sean B. Carroll|April 21, 2021|Nautilus
Just who is crazy enough to go swimming when the pond across the street has a layer of ice across the top?
Diving Into 2015 With Polar Bear Plunge Extremists|James Joiner|January 1, 2015|DAILY BEAST
When summer comes, adult beetles attack and larva feed in the cambium layer, girdling the trees and sealing their doom.
What It Takes to Kill a Grizzly Bear|Doug Peacock|November 23, 2014|DAILY BEAST
After maybe an hour, the firefighters had cut through the last layer of a 4- by 8-foot area.
Rescue at One World Trade Center|Michael Daly|November 13, 2014|DAILY BEAST

First you have to convince people to accept your version of the boundary between law and politics.
A Reminder: Our Justices are Politicians in Robes|Jedediah Purdy|November 13, 2014|DAILY BEAST
These words take on a dark layer of irony given the charges facing her.
Colombian Beauty Queen Arrested for Running Child Prostitution Ring|Jason Batansky|October 17, 2014|DAILY BEAST
It separates into three layers upon standing—a brown deposit, a clear fluid, and a frothy layer.
A Manual of Clinical Diagnosis|James Campbell Todd
Nearly all the mutineers swung round and galloped headlong for the landward boundary of the paddy field.
The Red Year|Louis Tracy
Boundary line between New York and Massachusetts agreed upon.
The Every Day Book of History and Chronology|Joel Munsell
Now they are approaching the long row of noble beeches that line the boundary of Mortlake.
Checkmate|Joseph Sheridan Le Fanu
The upper surfaces of the boilers were covered with a layer of ashes for the same purpose.
Life of Richard Trevithick, Volume II (of 2)|Francis Trevithick

British Dictionary definitions for boundary layer

boundary layer

noun

the layer of fluid closest to the surface of a solid past which the fluid flows: it has a lower rate of flow than the bulk of the fluid because of its adhesion to the solid

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012