Nelson-Denny Practice Test

The term that describes an illness or disease is "ailment." This word is commonly used in medical contexts to refer to a physical disorder or condition that negatively affects health. Ailments can range from mild conditions, like a cold, to more serious diseases, such as diabetes. It encompasses a broad spectrum of health issues, making it an appropriate choice for describing various forms of illness.

The other terms listed do not fit this definition. "Contamination" refers to the presence of harmful substances or organisms in a setting where they cause harm, often in the context of food, water, or other environments. "Dissection" is a procedure to study the structure of organisms and is not directly related to describing an illness. "Diversity" pertains to the variety and differences within a particular group and does not relate to health or disease implies. Thus, "ailment" is the most suitable term for describing an illness or disease.