Word parts are joined together with the combining vowel (o).
A combining vowel is usually used when the next linking word
part begins with a consonant.
The most common combining vowel is O.
However, when the next word part begins with a vowel, or the
preceding word part ends with a vowel, the combining vowel is
electrocardiogram, the combining vowel between
the root and the suffix was used even though the root word ended
with a vowel. This represents an exception to the rule of not
using the combining vowel, and may be effective when linking
some root words together. Look at this example.
The prefix peri- means around or surrounding.
Cardi still refers to the heart.
The suffix -itis means inflammation.
When you link the prefix peri- with the root word cardi, even
though the root begins with a consonant, no combining vowel is
Likewise, when you link the root word cardi with the suffix
-itis, no combining vowel is necessary.
In fact, in this instance, one of the i's is dropped. Pericarditis.
- Respiratory System
- (the lungs and airways)
use the roots
- pneum- (air or lung)
- pulmon- (lung) or
- bronch- (airway)