Arsenical tremor is a medical term that refers to a specific condition caused by exposure to arsenic. The symptoms include involuntary rhythmic muscle contractions, tremors, and twitching. Although there are no direct synonyms for this term, it can be described as "arsenic-induced tremors". Other related terms might include "arsenical-induced shakes" or "arsenic-induced muscle spasms". It is important to note that arsenical tremor is a specific medical condition, and while alternative terminology can be used to convey the same meaning, it is crucial for medical professionals to use the correct terminology for accurate diagnosis and treatment.