Which term describes the weakness of muscle?

The term that describes the weakness of muscle is "myasthenia." This medical terminology is derived from the Greek words "myo," meaning muscle, and "asthenia," meaning weakness. Therefore, myasthenia specifically refers to muscle weakness, which can be a symptom of various neuromuscular disorders, such as myasthenia gravis.

In contrast, atresia refers to a congenital absence or abnormal closure of a normal body opening, and hysteratresia pertains specifically to a condition related to the uterus. Meningocele is a type of spinal defect where the protective membranes around the spinal cord protrude through a gap in the spine. These terms do not relate to muscle weakness, which is why they do not apply in this context.