plantain-leaved pussytoes: a variety of pussytoes
cat's foot: low-growing perennial herb having leaves with whitish down and clusters of small white flowers
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