| Word | Description |
| Oats | Refers to the grain from species of Avena, the three best known being A. saliva, A.steritis and A .strigosa. Having large amounts of phytic acid, which can prevent the absorption of calcium from the diet and so induce rickets unless extra calcium and vit |
| Oedema | Excess fluid in the body indicated by pitting of the subcutaneous tissues when pressure gets applied with the finger. May be brought about by cardiac, renal or hepatic failure and by starvation9famine oedema). |
| Oenin | Refers to an anthocyanidin from the skin of purple grapes. |
| Oestriol | Urinary excretion product of the female hormones oestrone and oestradiol. |
| Oestrogens. | Female sex hormones. There are two groups, oestrone and oestradiol, which stimulate the ovaries, and progesterone, produced by the corpus luteum, which stimulates the uterus. Synethetic hormones inlcude ethinyl oestradiol, stilaboestrol and hexoestrol. |
| Oestrone | Refers to one of the female sex hormones. |
| Offal | Corruption of 'off-fall'. With reference to meat, the term includes all parts that are cut away when the carcass gets dressed, inc;uding liver, kidneys brain spleen, pancreas, thymus, tripe and tongue. In the USA the term used is 'organ meats'. With ref |
| Oilseed | A wide variety of seeds are grown as a source of oils, e.g., cottonseed, sesame, groundnut, sunflower, soya, palm, etc. After extraction of the oil the residue is a valuable source of protein, the so-called seed cake. |
| Oils, Essential | Essential oils |
| Oils, Fixed | Refers to the triglycerides, the edible oils, as distinct from the volatile or essential oils. |
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