What condition is described by the term "stenosis"?

The term "stenosis" specifically refers to the narrowing of a blood vessel or any tubular structure in the body. This condition can lead to restricted blood flow, which may cause various health issues depending on the location and severity of the narrowing. For instance, stenosis of the arteries can lead to conditions like ischemia, while spinal stenosis can cause nerve compression and associated symptoms.

The other terms described in the choices refer to different medical conditions. The formation of blood clots is known as thrombosis, excess fluid in tissues is termed edema, and hardening of the bone is referred to as sclerosis. Each of these conditions has distinct characteristics and implications for patient health, but they do not relate to the definition of stenosis.