boundary-layer control[′bau̇n·drē ‚lā·ər kən′trōl]Control over the development of a boundary layer by reduction of surface roughness and choice of surface contours. Abbreviated BLC. Methods used to control the boundary layer by sucking air through slots, making a series of small holes or porous surfaces, by blowing, or by using discrete jets. These methods can be employed to decrease drag or to increase lift on the whole or part of the surface.