boundary-layer

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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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

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