Entrainment (meteorology)

Entrainment is a phenomenon of the atmosphere which occurs when a turbulent flow captures a non-turbulent flow. It is typically used to refer to the capture of a wind flow of high moisture content, or in the case of tropical cyclones, the capture of drier air.

Detrainment is the opposite effect, when the air from a convective cloud, usually at its top, is injected in the environment.