1. (n.) Any affection which accompanies disease; a perceptible change in the body or its functions, which indicates disease, or the kind or phases of disease; as, the causes of disease often lie beyond our sight, but we learn their nature by the symptoms exhibited.

2. (n.) A sign or token; that which indicates the existence of something else; as, corruption in elections is a symptom of the decay of public virtue.

abnormality acute disease affection affliction ailment allergic disease allergy atrophy bacterial disease badge banner basis for belief birth defect blight body of evidence broad hint cardiovascular disease chain of evidence character characteristic chronic disease circulatory disease clue complaint complication condition congenital defect cue danger sign data datum defect deficiency disease deformity degenerative disease device differentia disability disease disorder distemper documentation early symptom earmark endemic endemic disease endocrine disease epidemic disease evidence exhibit fact facts falling barometer feature functional disease fungus disease gastrointestinal disease gathering clouds genetic disease gentle hint gesture glimmer glimmering grounds grounds for belief hallmark handicap hereditary disease high sign hint iatrogenic disease idiosyncrasy illness image implication index indicant indication indicator indisposition infectious disease infirmity inkling innuendo insignia insinuation intimation item of evidence keynote kick look malady malaise manifestation mark marker material grounds measure morbidity morbus muniments muscular disease mute witness neurological disease nod note nudge nutritional disease occupational disease omen organic disease pandemic disease pathological condition pathology peculiarity picture piece of evidence plant disease precursor preliminary sign premises premonitory sign premonitory symptom prodroma prodrome prognosis prognostic prognostication prompt proof property protozoan disease psychosomatic disease quarantine flag reason to believe red flag red light relevant fact representation representative respiratory disease rockiness scent seal secondary disease seediness sickishness sickness sigil sign signal signature significant signs skull and crossbones spoor stamp storm petrel stormy petrel suggestion sure sign suspicion symptomatology symptomology symptoms syndrome telltale telltale sign the pip thundercloud thunderhead token track trait urogenital disease virus disease warning sign warning signal wasting disease whisper wink worm disease yellow flag yellow jack