1 However, discomfort in the abdomen for any reason also may cause belching. 2  Therefore, belching does not always indicate the presence of excessive gas in the stomach. 3  Bloating is the subjective feeling that the abdomen is full but does not necessarily mean that the abdomen is enlarged.
caustic(Noun) Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic. caustic(Noun) The envelope of reflected or refracted rays of light for a given surface or object.
sharp or biting to the taste or smell; bitterly pungent; irritating to the eyes, nose, etc.: acrid smoke from burning rubber. 2. extremely or sharply stinging or bitter; exceedingly caustic: acrid remarks. Origin of acrid.