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Definition of Glabellum
1. n. The median, convex lobe of the head of a trilobite. See Trilobite.
Medical Definition of Glabellum
1. 
Origin: NL. See Glabella.
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1. n. The median, convex lobe of the head of a trilobite. See Trilobite.
1. 
Origin: NL. See Glabella.