‖Gla‐bel″lum (?), n.; pl.Glabella (#). [NL. See Glabella.] (Zoöl.) The median, convex lobe of the head of a trilobite. See Trilobite.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.