transverse wave

This term is primarily used in physics and acoustics to describe a specific mechanical behavior where the medium moves at a right angle to the energy flow. It is most frequently contrasted with longitudinal waves, such as sound waves in air, where the medium oscillates parallel to the direction of travel.

In practical application, the term is essential for describing light waves, seismic S-waves, and the vibration of strings. Because it describes a specific physical phenomenon, it is used almost exclusively in scientific, educational, or technical registers rather than in casual conversation.