The combining form nas(o) denotes which structure?

• A. Night
• B. Nose
• C. Eye
• D. Name

Answer: (B)

nas/o- denotes the nose. This combining form comes from Latin nasus and is used in terms that relate to the nasal area, like nasogastric (through the nose to the stomach) or nasopharynx (the nasal part of the pharynx). The other options point to different roots: night would use nyct/o or noct/o, the eye would use ocul/o, and a name would use onom/o or nomen/o. So nas(o) clearly means nose.