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Rydbergs
- a wave number characteristic of the wave spectrum of each element
Rydberg Constant
- a wave number characteristic of the wave spectrum of each element
- a wave number characteristic of the wave spectrum of each element
Rydberg Unit
- a wave number characteristic of the wave spectrum of each element
- a wave number characteristic of the wave spectrum of each element
REM
- (Roentgen Equivalent Man) the dosage of ionizing radiation that will cause the same amount of injury to human tissue as 1 roentgen of X-rays
- a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep
Roman Mile
- an ancient Roman unit of length equivalent to 1620 yards
Roman Pace
- an ancient Roman unit of length (4.85 English feet) measured as the distance from the heel of one foot to the heel of the same foot when next it touches the ground
Rwanda Franc
- the basic unit of money in Rwanda
Rial
- the basic unit of money in Iran
- the basic unit of money in Oman
- the basic unit of money in Yemen; equal to 100 fils
Rials
- the basic unit of money in Iran
- the basic unit of money in Oman
- the basic unit of money in Yemen; equal to 100 fils