What term describes something that causes nausea?

The term that best describes something that causes nausea is "nauseant." This word specifically refers to any substance or agent that induces feelings of nausea, which is a subjective sensation of an urge to vomit. In medical terminology, "nauseant" effectively conveys the idea of causing discomfort in the stomach, often related to motion sickness, certain medications, or various health conditions.

While "emetics" refers to substances that induce vomiting, which can also cause nausea, it is more specific to the act of prompting vomiting rather than merely causing the sensation of nausea itself. "Appendicitis" is an inflammation of the appendix and is associated with abdominal pain rather than directly causing nausea, even though nausea can be a symptom of appendicitis. "Dyspeptic" pertains to indigestion or discomfort after eating, which may involve nausea but isn't as precise in describing a direct cause of nausea. Thus, "nauseant" is the most accurate term among the options provided.