catch crop: a crop that grows quickly (e.g. lettuce) and can be planted between two regular crops grown in successive seasons or between two rows of crops in the same season
crop: a cultivated plant that is grown commercially on a large scale
ballistocardiograph: a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles