The Collaborative International Dictionary of English v.0.48:

Glabella \Gla*bel"la\, n.; pl. Glabell[ae]. [NL., fr. L.
   glabellus hairless, fr. glaber bald.] (Anat.)
   The space between the eyebrows, also including the
   corresponding part of the frontal bone; the mesophryon. --
   Gla*bel"lar, a.
   [1913 Webster]