An airfoil (32, 32A-E) comprising: a body (34, 34A-E); an airfoil wall (58A-E) forming an exterior surface (36, 36A-E) of the body (34, 34A-E); a cooling circuit (60A-E) disposed within the body (34, 34A-E); and a cooling hole (46, 46A-E) disposed in the airfoil wall (58A-E), wherein the cooling hole (46, 46A-E) fluidly connects the cooling circuit (60A-E) to the exterior surface (36, 36A-E) of the airfoil wall (58A-E), the cooling hole (46, 46A-E) comprising: a cavity (56A-E) disposed in a portion of the airfoil wall (58A-E), wherein a centerline axis (C LC) passes through a center of the cavity (56A-E), wherein a cross-section shape of the cavity (56A-E) taken along a plane perpendicular to the cavity centerline (C LC) comprises an ellipse; an inlet fluidly connecting the cooling circuit (60A-E) to the cavity (56A-E); an outlet (48, 48A-E, 74) disposed in a portion of the exterior surface (36, 36A-E) of the airfoil wall (58A-E), wherein the outlet (48, 48A-E, 74) fluidly connects the cavity (56A-E) to the exterior surface (36, 36A-E) of the body (34, 34A-E); and a rod (62A-E) of solid material disposed in the cavity (56A-E) and passing through a portion of the cavity (56A-E), characterized in that: the cavity (56A-E) is ring-shaped and comprises a tubular shape, the cooling hole (46, 46A-E) comprises a first side wall and a second side wall, and the airfoil is configured such that air travels through the cooling circuit, is delivered to the cavity through the inlet, travels around both sides of the rod along first sidewall and second sidewall, is pushed out of outlet, and is then delivered to the exterior surface of the airfoil. a body (34, 34A-E); an airfoil wall (58A-E) forming an exterior surface (36, 36A-E) of the body (34, 34A-E); a cooling circuit (60A-E) disposed within the body (34, 34A-E); and a cooling hole (46, 46A-E) disposed in the airfoil wall (58A-E), wherein the cooling hole (46, 46A-E) fluidly connects the cooling circuit (60A-E) to the exterior surface (36, 36A-E) of the airfoil wall (58A-E), the cooling hole (46, 46A-E) comprising: a cavity (56A-E) disposed in a portion of the airfoil wall (58A-E), wherein a centerline axis (C LC) passes through a center of the cavity (56A-E), wherein a cross-section shape of the cavity (56A-E) taken along a plane perpendicular to the cavity centerline (C LC) comprises an ellipse; an inlet fluidly connecting the cooling circuit (60A-E) to the cavity (56A-E); an outlet (48, 48A-E, 74) disposed in a portion of the exterior surface (36, 36A-E) of the airfoil wall (58A-E), wherein the outlet (48, 48A-E, 74) fluidly connects the cavity (56A-E) to the exterior surface (36, 36A-E) of the body (34, 34A-E); and a rod (62A-E) of solid material disposed in the cavity (56A-E) and passing through a portion of the cavity (56A-E), characterized in that: the cavity (56A-E) is ring-shaped and comprises a tubular shape, the cooling hole (46, 46A-E) comprises a first side wall and a second side wall, and the airfoil is configured such that air travels through the cooling circuit, is delivered to the cavity through the inlet, travels around both sides of the rod along first sidewall and second sidewall, is pushed out of outlet, and is then delivered to the exterior surface of the airfoil. a cavity (56A-E) disposed in a portion of the airfoil wall (58A-E), wherein a centerline axis (C LC) passes through a center of the cavity (56A-E), wherein a cross-section shape of the cavity (56A-E) taken along a plane perpendicular to the cavity centerline (C LC) comprises an ellipse; an inlet fluidly connecting the cooling circuit (60A-E) to the cavity (56A-E); an outlet (48, 48A-E, 74) disposed in a portion of the exterior surface (36, 36A-E) of the airfoil wall (58A-E), wherein the outlet (48, 48A-E, 74) fluidly connects the cavity (56A-E) to the exterior surface (36, 36A-E) of the body (34, 34A-E); and a rod (62A-E) of solid material disposed in the cavity (56A-E) and passing through a portion of the cavity (56A-E), the cavity (56A-E) is ring-shaped and comprises a tubular shape, the cooling hole (46, 46A-E) comprises a first side wall and a second side wall, and the airfoil is configured such that air travels through the cooling circuit, is delivered to the cavity through the inlet, travels around both sides of the rod along first sidewall and second sidewall, is pushed out of outlet, and is then delivered to the exterior surface of the airfoil.