Impossible to reverse or to be reversed; unchangeable, permanent with no significant chance of improvement, as in irreversible brain damage...

Not able to be returned to normal, as an irreducible hernia.  

Large, cylindrical device formerly used as a means of providing artificial respiration for victims of disease (especially poliomyelitis). The patient’s...

Swelling of the iris of the eye.  

Inflammation of the iris and cornea of the eye.  

Inhaled bronchodilator, similar to atropine, that is effective in the long-term treatment of chronic obstructive pulmonary disease. Although it has...

Photosensitive chemical in the cones of the retina that plays a part in color vision.  

Entry of a foreign substance into a blood vessel.  

Aneurysm of a cranial artery. Symptoms include headache, stiff neck, nausea, and sometimes loss of consciousness; rupture of the aneurysm...

Inflammation of the stomach and intestine caused by a virus; symptoms include abdominal discomfort, nausea, vomiting, and diarrhea.