A pair of eyebrows which meet in the middle.
A unibrow (or jacco brow or monobrow; called synophrys in medicine) is a single eyebrow created when the two eyebrows meet in the middle above the bridge of the nose. The hair above the bridge of the nose is often of the same color and thickness as the eyebrows, giving the appearance that they converge to form one uninterrupted line of hair.
a pair of eyebrows that meet above the nose, giving the appearance of a single eyebrow
‘his wealth and cool outweigh his potato head and monobrow’;