Meaning

noun (medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease

noun anything that accompanies X and is regarded as an indication of X's existence

originFrom Middle English sinthoma, from Medieval Latin sinthoma, altered by Late Latin symptoma, from Ancient Greek σύμπτωμα (súmptōma, “a happening, accident, symptom of disease”), from stem of συμπίπτω (sumpíptō, “Ι befall”), from συν- (sun-, “together”) + πίπτω (píptō, “to fall”). See also syn-, -oma, -ome.

Etymology from Wiktionary, CC BY-SA 3.0