Is there combining vowel in pulmonology?

Let's break down the word "pulmonology" to see if there's a combining vowel:

* Pulmon-: This is the root word, meaning "lung" (from Latin "pulmo").

* -ology: This is a suffix meaning "the study of."

Notice that there is no combining vowel between "pulmon" and "-ology." The "o" is part of the suffix "-ology."

Combining vowels are used to make pronunciation easier when combining root words and suffixes. In this case, the "o" in "-ology" already provides a smooth transition, making a combining vowel unnecessary.