the finest example; the best (of)
Figurative use, often in the pattern ～の白眉 to single out the most outstanding work or person in a group. Derived from a classical Chinese story about Ma Liang, whose white eyebrows marked him as the most talented among his brothers.
This film is the finest among his works.
white eyebrows
Literal, original meaning. Rarely used in modern Japanese outside of historical or descriptive contexts.
The old man's white eyebrows were striking.
The highlight of this exhibition is that large sculpture.