noun
amount of hair; hair volume
Colloquial term used mainly in beauty, grooming, and hair-care discussions to refer to the quantity or thickness of hair.
加齢とともに毛量が減ってきた。
My hair volume has decreased with age.
このシャンプーは毛量を増やす効果があるらしい。
This shampoo is said to have the effect of increasing hair volume.