Final answer:
A dry cough is also known as a hollow cough. It is characterized by the absence of mucus or phlegm.
Step-by-step explanation:
Another term for a dry cough is option 3) Hollow cough. A dry cough is characterized by the absence of mucus or phlegm production, and it is often described as irritating or scratchy in the throat without the expulsion of respiratory secretions. Unlike a wet cough (option 1), which is also known as a productive cough (option 2) due to the presence of mucus, a dry cough does not produce such secretions. A barking cough (option 4) is associated with a distinctive sound resembling a seal or bark and is often indicative of conditions affecting the upper airways, particularly seen in croup. The term "hollow cough" is sometimes used colloquially to describe the sound of a dry cough.