body mass index A measurement relating body weight to height in an organism; typically calculated as the weight of an individual divided by the height of that individual squared. For quadrupeds, the square of body height is often replaced by the square of body length. BMI CMO:0000105 EFO:0004340 EFO:0005851 EFO:0005935 EFO:0005936 EFO:0005937 EFO:0007041 VT:0001259 body mass index clinical_measurement_ontology height-adjusted body mass index longitudinal BMI measurement obese body mass index status overweight body mass index status underweight body mass index status calculated body weight measurement