Power

One of two main types of skeletal muscle fibers. Fast-twitch fibers are recruited most heavily when bursts of power are needed, as in sprinting. See also slow-twitch fiber.

A hearing aid’s power, measured in the number of decibels that it can add to sound.

A legal form allowing a person to appoint someone else to make their medical decisions. Also known as a durable power of attorney for health care.

Small structures within cells that create break down nutrients and create energy for cells. Known as the power producers or energy factories of cells.