Dictionary Results Browse the Dictionary Click on any of the letters below to browse all terms beginning with that letter. A|B|C|D|E|F|G|H|I|J|K|L|M|N|O|P|Q|R|S|T|U|V|W|X|Y|Z yam the thick, starch tuber of various tropical vines native to Asia (genus Dioscorea) unrelated to the potato and sweet potato; has an off-white to dark brown skin, flesh that can range from creamy white to deep red and is less sweet that a sweet potato yeast a microscopic fungus that converts its food (carbohydrates) into carbon dioxide and alcohol through a metabolic process known as fermentation; yeast is necessary for making beer, wine, cheese and some breads