British Thermal Unit is a standard unit of energy that is measured at about 1055 joules. The British Thermal Unit (BTU or Btu) is primarily used in the United States more than in the United Kingdom. This energy unit is the total amount of thermal energy that is required to heat or cool 1 pound of water significantly by 1Â°Fahrenheit.
Bradyphrenia is a neurological term referring to the slowness of thought common to many disorders of the brain.
Bradycardia (bray-dee-car'-dee-ah) is the medical term for a heart rate that is too slow. How slow is too slow varies. Babies usually have heart rates faster than adults do; so a heart rate of 80 may be fine for an adult but may be low for a newborn.