scleroprotein: a simple protein found in horny and cartilaginous tissues and in the lens of the eye
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
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