the world > textiles and clothing > clothing > types or styles of clothing > headgear > parts of headgear > [noun] > projecting front > (peak) of cap (5)
spec. The stiff projecting part at the front of a cap. Now chiefly British.
Something which affords protection from light, heat, etc. The part of a head-dress that projects in front so as to shade the eyes; the peak of a cap.
U.S. The stiff rounded part on the front of a cap; = peak, n.2 2c.
North American. The peak of a cap.