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“lexicologies”
A branch of linguistics dealing with the use and meanings of words and the relationships between various structures of vocabulary: "Lexicology involves the study of words, their nature and meanings, word elements, semantic relations, word groups, and even whole dictionaries."
This entry is located in the following units:
lexico-, lexi-, lex-, -lexia, -lexias, -lexic, -lectic, -lexis
(page 2)
-ology, -logy, -ologist, -logist
(page 41)