Which root word means "outside"?

Prepare for the AAERT Certified Deposition Reporter Exam. Use flashcards and multiple choice questions with explanations and hints. Be confident and ready for your test day!

The root word that means "outside" is indeed "Exo-." This prefix is derived from Greek, where it signifies something that is external or situated on the outside. It is commonly used in various scientific and medical terms to denote an external position or structure, such as in "exoskeleton," which refers to an external skeleton that supports and protects an animal's body.

In contrast, the other root words possess different meanings. "Endo-" refers to something that is internal or inside, as seen in terms like "endoscope," which is a device used to examine inside the body. "Epi-" means "upon" or "over," indicating a position on the surface or above, as in "epidermis," which is the outer layer of skin. "Hydro-" pertains to water, often used in contexts related to fluids or liquid domains, such as "hydroelectric." Thus, "Exo-" is the correct and fitting choice for the meaning "outside."

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