Англо-русский синонимический словарь. 2014.
gypsous — … Useful english dictionary
gypsum — n. form of calcium sulphate used in making plaster of Paris; form of alabaster. ♦ gypseous, ♦ gypsous, a. ♦ gypsiferous, a. containing gypsum … Dictionary of difficult words
gipsous — var. gypsous … Useful english dictionary