(Chiefly in plural) any of several ridges or projections (usually forming an ordered array) which serve to dissipate heat from a device such as an engine or electronic equipment by increasing surface area.
Origin
Early 20th century.
Definition of cooling fin in US English:
cooling fin
noun
(Chiefly in plural) any of several ridges or projections (usually forming an ordered array) which serve to dissipate heat from a device such as an engine or electronic equipment by increasing surface area.