a mass of very small drops of liquid forced into the nose using a special device, in order to put medicine into the body or to clear the nose

They make a flu vaccine in the form of a nasal spray. 他们以鼻腔喷雾剂的形式制作流感疫苗。

A saline nasal spray will relieve congestion in the nose. 盐水鼻腔喷雾剂可以缓解鼻塞。

I, personally, cannot do without nasal spray because I find it difficult to breathe. 我个人是离不开鼻腔喷雾的，因为我觉得呼吸困难。