1) Prodromic 2) Symptom 1) Prodromic 
• (a.) Of or pertaining to prodromes; as, the prodromal stage of a disease.
Premonitary; a symptom of sign of disease, which appears very early and indicates the presence of the disease.A prodromal sign is an early indication of a disease - often before classical symptoms appear.
Prod'ro·mal adjective (Medicine) Of or pertaining to prodromes; as, the prodromal stage of a disease. 
Type: Term Pronunciation: prō-drō′măl, prod′rō-măl Definitions: 1. Relating to a prodrome. Synonyms: prodromic, prodromous, proemial
Pertaining to symptoms indicating the onset of a disease. May include symptoms prior to those adequate for accurate diagnosis.
[adj] - symptomatic of the onset of an attack or a disease
prodromal Premonitory; indicating the onset of a disease or a morbid state. Related before-word units: ante-; antero-; anti-; pre-.
An early symptom indicating the onset of an attack or a disease.
prodromic adjective symptomatic of the onset of an attack or a disease