A surname.

Cephalorhynchus heavisidii, a small dolphin endemic to the Benguela ecosystem along the southwest coast of Africa.

plural of Heaviside layer

Synonym of Kennelly-Heaviside layer

(mathematics) The function whose value is zero if its independent variable is negative, and one otherwise.

plural of Heaviside unit function

A layer of ionized gas occurring between roughly 90–150 km (56–93 mi) above the ground. It reflects medium-frequency radio waves, and thus enables them to be propagated beyond the horizon.

plural of Kennelly-Heaviside layer