Category: N

Congenital absence of the back of the skull.  

Reduction of the opening of the naris on the affected side in lung disease in proportion to lessened alveolar air capacity on the affected side.  

Homesickness; longing to return home.  

A species of rat fleas responsible for transmission of murine typhus and possibly plague.  

A disease-causing plant microorganism.  

A spring like device applied to the bridge of the nose that pulls the nostrils open slightly. The device may reduce nasal airway resistance, thereby improving sleep quality and decreasing snoring.  

The portion of a microscope to which the objective lenses attach.  

A genus of parasites of the order Microsporidia.  

A rare form of scabies in which the mites are present in great number. It often is found in patients with human immunodeficiency virus infection. Ivermectin is used to treat the infestation.  

A scale used to predict the likelihood a patient will develop pressure ulcers. The patient is rated from 1 (low risk) to 4 (high risk) using the following five criteria: physical condition, mental condition, activity, mobility, and incontinence.