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orbit
The path one body takes around another.
ordeal
A painful or difficult experience.
orderly
Neatly arranged or organized.
ore
A mineral or rock containing valuable metal.
organ
A part of the body with a specific function.
organism
A living thing, like a plant or animal.
organized crime
Illegal business run by large, well-organized criminal groups.
orientation
An introduction that helps someone become familiar with a place.
originally
at first; in the beginning
out of one's mind
acting very strangely or irrationally.
out of the blue
unexpectedly or without warning
out of the question
not possible or acceptable.
outweigh
To be greater in importance or significance.
over and over
Many times, again and again.
over my dead body
refusal to allow something to happen
overdue
not paid or returned on time
overgraze
To let animals eat so much plant cover that the land is harmed.
oxygen
A gas essential for breathing and combustion.
ozone
A gas that protects Earth from harmful sun rays.
package
A wrapped container for goods.
paleontologist
A scientist who studies fossils to learn about ancient life.
pancreas
An organ that produces digestive enzymes.
parasite
An organism that lives on another and harms it.
parody
A humorous imitation of something serious.
Words selected by Inoh for the TOEFL iBT test. Not an official ETS list. How these words were chosen →