boundary layer

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.

Origin:
1920–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
boundary layer
 
n
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 10th Edition
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Example sentences
In the unaltered or boundary layer, however, the glandular epithelium retains a columnar or cubical form.
Dimples on a golf ball create a thin turbulent boundary layer of air that clings to the ball's surface.
But as the flow rate decreases, the boundary layer re-attaches to the surface causing dribbling.
The boundary layer changes from laminar to turbulent at a transition point.
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