Macnaha qaamuuska ee ereyga "meel" waa in la xaddido ama lagu koobo shay meel ama meel gaar ah. Waxa loola jeedaa habka loo sameeyo wax xaddidan ama gaar ah meel ama gobol gaar ah. Waxa kale oo ay macnaheedu noqon kartaa in shay ku urursan yahay ama diiradda saarayo meel gaar ah ama qayb ka mid ah jidhka. Tusaale ahaan, infekshan gudaha ah waa caabuq ku kooban meel gaar ah ama qayb ka mid ah jirka, halkii uu ku faafi lahaa jirka oo dhan.