An audiometer is a specialized medical instrument that measures your ability to hear certain sounds. Doctors use audiometers to diagnose hearing loss.
The word audiometer combines audio, a word derived from a Latin word meaning "hear," and meter, from Greek and Latin words meaning "measure." A typical audiometer has headphones attached to a machine that makes a series of beeping sounds at different pitches and frequencies. You signal, usually by pressing a button, to show that you've heard a sound. The machine records the results and produces a graph, called an audiogram, which plots your hearing across different frequencies and pitches in each ear.