star (white patch on a horse's forehead)
Rare equestrian term for a white marking on a horse's forehead. Cross-referenced with 星月 (ほしづき), another term for a star marking.
See also: 星月
This horse's star is small, just like a real star.
Compound of 白 (しろ, 'white') and 額 (ひたい, 'forehead'). The reading しろびたい is a straightforward combination.