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.
Noun. 1. caustic-any chemical substance that burns or destroys living tissue. chemical compound, compound - (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight. lye-a strong solution of sodium or potassium hydroxide.