What is the meaning of Glabellum?

(n.) The median, convex lobe of the head of a trilobite. See Trilobite.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). glabellum. Retrieved September 23, 2026, from http://smartdefine.org/glabellum/definitions/2012327
ChicagoWebster's. 2011. "glabellum" http://smartdefine.org/glabellum/definitions/2012327 (accessed September 23, 2026).
HarvardWebster's 2011, glabellum, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/glabellum/definitions/2012327>.
MLAWebster's. "glabellum" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/glabellum/definitions/2012327>