variant of glosso-: glottology.
Origin of glotto-
< Greek (Attic) glōtto-, combining form of glôtta; see glottis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
word-forming element meaning "language," from Attic Greek glotto-, from glotta "tongue, language" (see gloss (n.2)).
Online Etymology Dictionary, © 2010 Douglas Harper