hairline

1 ENTRIES FOUND:
hairline /ˈheɚˌlaɪn/ noun
plural hairlines
hairline
/ˈheɚˌlaɪn/
noun
plural hairlines
Britannica Dictionary definition of HAIRLINE
[count]
1 
: a thin line or crack — often used before another noun
2 
: the line where your hair starts on your forehead