Origin: Latin suffix -al
Clinical trial has 2 different meanings across 1 category:
a rigorously controlled test of a new drug or a new invasive medical device on human subjects; in the United States it is conducted under the direction of the FDA before being made available for general clinical use
A test of a medication or other medical treatment (such as a medical device), usually a comparison against a placebo, other medications or devices, or the standard medical treatment for a patient's condition.