abnormally high level of acidity, or low level of alkalinity, in the body fluids, including the blood, a pathologic condition resulting from accumulation of acid or depletion of the alkaline reserve (bicarbonate content) in the blood and body tissues, and characterized by an increase in hydrogen ion concentration (decrease in pH), kudede happelisus, happemürgistus(seisund), (vere) liigne happesisaldus, organismi mürgistus kehas tekkivate happeliselt reageerivate ainetega, happemürgistus, haige veres ilmnev happe ja aluse tasakaalu häire, harilikult happeliste ainevahetussaaduste kuhjumine (suhkurtõve, maksa- ja neeruhaiguste korral)