noun
beautiful eyelashes
Refers to eyelashes that are aesthetically pleasing, often used in beauty contexts.
彼女は美まつげで、マスカラいらずだ。
She has beautiful eyelashes and doesn't need mascara.
まつげ is the general word for eyelashes, while 美まつげ specifically emphasizes their beauty.
Compound of 美 (び, 'beauty') and まつげ ('eyelashes').