CRESS, noun [G., Latin ] The name of several species of plants, most of them of the class tetradynamia. Watercresses, of the genus Sisymbrium, are used as a salad, and are valued in medicine for their antiscorbutic qualities. The leaves have a moderately pungent taste. They grow on the brinks of rivulets and in other moist grounds. The word is generally used in the plural.