[mes.sen.ger] n [ME messangere, fr. OF messagier, fr. message] (14c) 1: one who bears a message or does an errand: as a archaic: forerunner, herald b: a dispatch bearer in government or military service c: an employee who carries messages
2: a light line used in hauling a heavier line (as between ships)
3: a substance (as a hormone) that mediates a biological effect
4: messenger rna