Category: R
-
Recommended daily allowance
Optimum quantity of various nutrients required to maintain health, as recommended, from time to time, by authoritative national or international agencies. These RDA’s’ differ according to age, sex, nutritional stresses like pregnancy and lactation, and so on.
-
Rancid taste
Any unpleasant departure from the normal taste of a food, usually brought on by oxidation, hydrolysis, fermentation and the like. The fat component is particularly susceptible to such off-flavours.
-
Rust fungus
Any of a large group of plant-parasitic fungi characterized by the production of tiny but profuse spore-bodies that erupt from the host plant’s leaves or stems, usually yellow, orange or rusty brown in color. Wheat rust is the most economically significant, but poplar rust is one of the most commonly and easily seen.
-
Rock garden
A garden or area of a larger garden constructed mainly of large rocks, carefully arranged as they might occur in nature. Not to be confused with the more humble rockery, which is usually smaller and less ambitious in scope.
-
Reed
A tall grass that grows in shallow water or boggy ground. The common reed is Phragmites australis, a species of worldwide occurrence.
-

Rootball
The root mass and surrounding soil of a container-grown plant or a plant dug out of the ground.
-
Ryle’s tube
A thin tube which is passed into the stomach through either the nose or mouth, used to pump out the contents of the stomach or to introduce a barium meal in the stomach [Described 1921. After John Alfred Ryle (1882-1950), physician at London, Cambridge and Oxford, UK.] A slightly weighted rubber tube that is inserted…
-
Russell traction
A type of traction with weights and slings used to straighten a femur which has been fractured [Described 1924. After R. Hamilton Russell (1860-1933), Australian surgeon.]
-
Ruptured spleen
A spleen which has been torn by piercing or by a blow.
-
Running sore
A sore which is discharging pus.