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radio
Device that receives broadcast audio signals.
radioactive
Emitting radiation as a result of decay.
radioactivity
The release of energy from unstable atoms.
radiocarbon
A radioactive isotope used for dating ancient objects.
radiography
The use of X-rays to view inside objects.
Radiohead
a popular English rock band
radiological
related to imaging or radiation
radiologist
A doctor specializing in medical imaging.
radiology
The branch of medicine using imaging techniques.
radiotherapy
Treatment using radiation to kill cancer cells.
radish
a small, round, crunchy vegetable, often spicy.
radium
A radioactive element once used in glow-in-the-dark paint.
radius
line from center to the circle's edge
radon
A colorless, odorless gas from the ground.
raff
a poor or low-class person.
raffle
A lottery for a prize, often for charity.
raft
a large number or collection of something
rafter
A beam supporting a roof structure.
rafter snapper
a rare and highly valued marine fish
rag
A piece of old fabric.
rag bagger
A person who collects discarded items.
rage
to act in a violent or uncontrolled manner
raglan
a sleeve that extends fully to the collar
Ragnarok
In Norse mythology, a series of events leading to destruction.