glabellan.

glabella (n.)"space between the eyebrows," 1590s, Modern Latin, noun use of fem. of adjective glabellus "without hair, smooth," diminutive of glaber "smooth, bald," from PIE *gladh- "smooth" (see glad) + diminutive word-forming element -ella. As the word for a part of the head of a trilobite, from 1849.