The smooth, flattened area of the frontal bone on the skull located between the eyebrow ridges, or the skin surface above this bone on the living forehead.
Modern Latin anatomical term: from Latin glaber 'smooth, bald' plus diminutive suffix -ella; used in both skeletal anatomy and dermatology.
The glabella is so consistent in humans that anthropologists use it to identify skull features, and Botox treatments famously target this area because smoothing wrinkles here dramatically changes how you appear to express emotion.
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