electromagnetic radiation: radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge
radiation: energy that is radiated or transmitted in the form of rays or waves or particles
body mass index: a measure of someone's weight in relation to height; to calculate one's BMI, multiply one's weight in pounds and divide that by the square of one's height in inches; overweight is a BMI greater than 25; obese is a BMI greater than 30