Home › Words › M › midlinermidlinermidliner means (rare).EtymologyFrom midline + -er.noun(rare)e.g.“Goldstein (1976) studied the physiological responses of repressers, midliners, and sensitizers to affective stimulus vignettes.” — 1981, Michael Gary Lieberman, Psychophysiological Correlates of Measures of Empathy, page 43:Definitions & examples from Wiktionary (CC BY-SA 3.0).