noun 1 : the use of more words than those necessary to denote mere sense (as in "the man he said") : redundancy 2 : an instance or example of pleonasm
Does the overtalker in your life use more words than is necessary to denote mere sense? If so, you may rightfully accuse them of pleonasm. It's a word more than four centuries old, and it shares a satisfying final syllable with spasm and sarcasm, making it ripe for lobbing (good-naturedly, of course) at a friend. It comes from the Greek word pleonazein, meaning "to be excessive," from pleiōn or pleōn, meaning "more."