noun
hair; hairline
Refers to a single strand of hair or the line of hair growth, often used in contexts like hairlines or fine hairs.
彼は毛筋が後退してきた。
His hairline has started to recede.
鏡で毛筋を一本抜いた。
I plucked a single hair while looking in the mirror.
noun
Used in the phrase 毛筋ほど to mean 'even a tiny bit' or 'not even a hair's breadth', emphasizing insignificance or lack of something.
彼の話には毛筋ほどの真実もない。
There isn't a shred of truth in his story.
noun
comb lines; comb tracks
Refers to the lines or tracks left in hair after combing.
髪に毛筋がついている。
There are comb lines in your hair.