A combining vowel is not required when two word roots are joined together.

Question

Quizplus · Accepted Answer

A combining vowel, such as -o- or -i-, is often needed to separate the two word roots in medical terminology to improve clarity and pronunciation. For example, "cardiomyopathy" combines the word roots "cardio" (heart) and "myo" (muscle), with the combining vowel -o-. Without the combining vowel, the word would be "cardmyopathy" which is difficult to pronounce and understand.

A Combining Vowel Is Not Required When Two Word Roots