Singular Spasm is a medical term used to describe a sudden, involuntary muscle contraction. It is also known as a 'THROE, ' which is a five-letter word that is one of the solutions to the crossword puzzle. A singular spasm can be caused by a variety of factors, including stress, fatigue, and certain medical conditions. It can cause pain and discomfort, and in some cases, it can be a sign of a more serious underlying condition.