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Grade 7
Glossary
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List of words for Letter 'R'
Click on
to hear the word and definition.
radiation therapy
Medical treatment that uses radiation to destroy cancer cells within the body.
radon
An odorless, colorless, radioactive gas formed by natural processes in rocks, soil, and water.
random event
An event that is beyond a person’s control.
rape
The threatened or actual use of physical force to get someone to have sex without consent, or sexual contact with a minor.
reaction time
The time it takes a person to respond to something noticed by the senses.
recycle
To alter waste products so that they can be used again.
referee
An official who enforces rules at a sports event.
renewable resource
A natural substance, such as water, wind, and sunlight, that can be replaced once it is used.
repetition
The number of times an exercise is performed.
reproductive system
The group of organs and other structures that enables humans to produce offspring.
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