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Using Prefixes, Suffixes, Roots

You know what an astronaut is. The prefix astro means “star,” and the root naut means “sailor.” So an astronaut sails among the stars. Now, what is a cosmonaut? The prefix cosmo means “universe,” so a cosmonaut sails the universe. These words are almost the same, except that astronauts come from the United States and cosmonauts come from Russia!

Building Words from Parts

On the next nine pages, you will find a dictionary of common prefix, suffix, and root. This dictionary will help you learn vocabulary words, which you can record in your new-word notebook. (See page 235.)