Summary: The Latin root word *medi* means "middle." This Latin root is the word origin of a large number of English vocabulary words, including [*medi*]eval, [*medi*]ocre, and [*medi*]a. This Latin root word *medi* is easily recalled through the word [*med*]ium, for a "[*med*]ium" temperature is right in the "middle" of being hot and cold.
