The ornamental design for a diffusernozzle for a hair dryer, as shown and described.
FIG. 1 is a right side elevational view of the diffuser nozzle for a hair
dryer according to the present invention shown in combination with a hair
dryer;
FIG. 2 is a top plan view thereof, with the bottom view being identical;
FIG. 3 is a right side elevational view thereof, with the left side
elevational view being identical; and,
FIG. 4 is a front elevational view thereof.
The broken line showing of the hair dryer, including the cross-hatched
pattern indicative of a black color is for illustrative purposes only and
forms no part of the claimed design.