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Ru 486
- an abortion-inducing drug (trade name Mifepristone) developed in France; when taken during the first five weeks of pregnancy it blocks the action of progesterone so that the uterus sloughs off the embryo
Relay Links
- an amplifier for restoring the strength of a transmitted signal
Relay Stations
- an amplifier for restoring the strength of a transmitted signal
Relay Transmitters
- an amplifier for restoring the strength of a transmitted signal
Roman Collar
- a stiff white collar with no opening in the front; a distinctive symbol of the clergy
Ram Disk
- (computer science) a virtual drive that is created by setting aside part of the random-access memory to use as if it were a group of sectors; "access to a RAM disk is very fast but the data it contains is lost when the system is turned off"
Rayleigh Disk
- an acoustic radiometer consisting of a light disk suspended from a quartz thread; when exposed to a progressive sound wave its torque can measure velocity
Reaumur Thermometer
- an alcohol thermometer calibrated in degrees Reaumur
Rochon Prism
- optical device that produces plane-polarized ultraviolet light
Roller Blade
- a shoe with rollers fixed to the sole in a line
- travel on shoes with a single line of rubber wheels attached to their soles; "you''d better wear a helmet and knee protectors when you roller blade!"