A doctor’s note of a burn on the “R digit 5” places the burn on the right little finger or toe.
Roentgen, an international unit of X-radiation or gamma-radiation.
In chemistry, a radical.
On a prescription, R (or Rx), recipe, which is Latin for “to take”.
- RDS (respiratory distress syndrome)
Formerly known as hyaline membrane disease, a syndrome of respiratory difficulty in newborn infants caused by a deficiency of a molecule called surfactant. RDS almost always occurs in newborns born before 37 weeks of gestation. The more premature the baby is, the greater is the chance of developing RDS. RDS is more likely to occur […]
Being absorbed again. For example, the kidney selectively reabsorbs substances it has already secreted into the renal tubules, such as glucose, protein, and sodium. These reabsorbed substances are returned to the blood.
- Reaction kinetics
The rate of change in a biochemical (or other) reaction.
- Reaction, allergic
A reaction that occurs when the immune system attacks a usually harmless substance (an allergen) that gains access to the body. The immune system calls upon a protective substance called immunoglobulin E (IgE) to fight these invading allergic substances (allergens). Even though everyone has some IgE, an allergic person has an unusually large army of […]
- Reaction, chemical
A process in which one substance is transformed into another. Thousands of different types of chemical reactions occur in the body and are essential to its structure and function.