| Word | Description |
| Rabbit | Furry rodent, Lepuscuniculus |
| Racemic Compounds | Refers to a mixture of two isomers which cancel their optical activity, which see. |
| Rad | Unit of measurement of the energy absorbed from ionising radiation defined as the absorption of 100 ergs gram of substance. Superseded by the gray. |
| Radioallergosorbent Test (RAST). | Test for food allergy. |
| Radishes | Root of Raphanus genus. |
| Raffinade | Best-quality refined sugar. |
| Reffinose | Trisaccharide fround in cooton seed, sugar-beet molasses and australian manna. |
| Raisin Oil | Obtained from seeds of Muscat grapes, which are removed before drying the grapes for raising. The oil finds use primarily to coat the raising to prevent them sticking together, and render them soft and pliable and subject to insect infestation. |
| Ralston | American breakfast cereal; whole wheat plus added wheat germ. |
| Remekin | (1) Porcelain or earthenware mould in which mixture gets baked and then brought to the table. Paper souffle cases nowadays called ramekin cases. (2) Formerly the name given to toasted cheese; now tarts filled with cream cheese are called ramekins. |
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