carbon monoxide. 1. a colorless, odorless, poisonous gas, CO, that burns with a pale-blue flame, produced when carbon burns with insufficient air: used chiefly in organic synthesis, metallurgy, and in the preparation of metal carbonyls, as nickel carbonyl. Origin of carbon monoxide. 1870-1875.
Indigestion is often a sign of an underlying problem, such as gastroesophageal reflux disease (GERD), ulcers, or gallbladder disease, rather than a condition of its own. Also called dyspepsia, it is defined as a persistent or recurrent pain or discomfort in the upper abdomen. The symptoms of indigestion include:
1 Your indigestion symptoms change noticeably. 2  Your symptoms last longer than a few days. 3  You have unexplained weight loss. 4  You have sudden, severe abdominal pain. 5  You have trouble swallowing. 6  You have yellow coloring of the skin and eyes (jaundice).  You vomit blood or pass blood in the stool.