| Word | Description |
| Zeaxanthin | Refers to one of the carotenoid pigments in maize, yolk and Physalis (Chinese lantern). It has no vitamin activity. It is used as a colouring. |
| Zest | Outer skin of citrus fruits. |
| Zinc | Refers to a dietary essential that is part of the structure of about 20 enzymes, including carbonic anhydrase, alcohol dehydrogenase and superoxide dismutase. |
| Zomotherap | Treatment of convalescents with raw meat or me juicelong since discontinued. |
| Zoopherin | Vitamin B12. |
| Zooplankton | Wide variety of very small crustacians and other invertebreates which are mixed with the yound of larger fish, which live upon the phytoplankton (although some are carnivorous) and serve, in turn, as a food supply of small fish and other marine life. |
| Zwieback | German term for twice-baked bread. It is ordinary dough plus eggs and butter, baked, sliced, baked again to a rush\k and sometimes sugar coated. |
| Zymase | Name assigned to the mixture of enzymes in yeast which is responsible for fermentation. |
| Zymogens | Refers to the inactive form in which some exzymes exist before being liberated by the action ofa kinase. For example, trypsinogen and pepsinogen are secreted in the intestine and converted into their active forms, trypsin and pepsin. |
| Zymotachygraph | Refers to an instrument that is able to measure the gas produced in a fermenting dough and the amount escaping from the dough. |
