Spinach (Spinacia oleracea) is an edible flowering plant in the family of Amaranthaceae. It is native to central and southwestern Asia. It is an annual plant (rarely biennial), which grows to a height of up to 30 cm. Spinach may survive over winter in temperate regions. The leaves are alternate, simple, ovate to triangular-based, very variable in size from about 2-30 cm long and 1-15 cm broad, with larger leaves at the base of the plant and small leaves higher on the flowering stem. The flowers are inconspicuous, yellow-green, 3-4 mm diameter, maturing into a small hard dry lumpy fruit cluster 5-10 mm across containing several seeds. Dehydration (hypohydration) is defined as excessive loss of body water. It is literally the removal of water (Ancient Greek: ?d??, hÃ½dor) from an object. In physiological terms, it entails a relative deficiency of water molecules in relation to other dissolved solutes. Some definitions even require a rise in blood sodium concentration, but in reality a loss of body water usually accompanies a loss of solutes as well.