Brachia, which is the plural form of the word brachium, refers to the upper limbs or arms of humans. While brachia is commonly used in the field of anatomy, there are several synonyms for this term that you may find useful. Some of these synonyms include limbs, arms, upper limbs, upper extremities, and appendages. Other less common synonyms for brachia include branchia, brachials, and brachids. These synonyms can be useful if you are writing about the anatomy of the human body, or if you are looking for alternative terms to use in medical or scientific contexts.