Chronic

{
  "id": "MLC-T-ENV-004983",
  "term": "Chronic",
  "field": "Environment",
  "definition": "1. Used to describe recurring symptoms or disease.\n\n2. Involving a stimulus that is lingering or continues for a long time; often signifies periods from several weeks to years, depending on the reproductive life cycle of the species. Can be used to define either the exposure or the response to an exposure (effect). Chronic exposures typically induce a biological response of relatively slow progress and long duration.\n\n3. A stimulus that lingers or continues for a relatively long period of time, often one-tenth of the life span or more. Chronic should be considered a relative term depending on the life span of an organism. The measurement of a chronic effect can be reduced growth, reduced reproduction, etc., in addition to lethality.\n\n4. Occurring over a long period of time, either continuously or intermittently; used to describe ongoing exposures and effects that develop only after a long exposure.\n\n5. Occurring over a long time (compare with acute).",
  "subject": "Water",
  "references": [
    "Ag 101 Glossary of American Agriculture",
    "Waste and Cleanup Risk Assessment Glossary",
    "National Pollutant Discharge Elimination System (NPDES) Glossary; Urban Watershed Management Research Terminology",
    "Drinking Water Technical & Legal Terms",
    "ATSDR 2004"
  ],
  "url": "https://mlchart.com/terminology/environment/chronic/"
}