PONT/O, CRANI/O, FORAMIN/O, _______.
Based on the pattern in the given word examples (PONT/O, CRANI/O, FORAMIN/O), it appears that the words follow a structure of combining a root word with the suffix "/O." In medical terminology, the suffix "/O" is often used to indicate an opening or a passageway.
To find the missing word following the same pattern, we need to identify a root word related to an opening or passageway and add the suffix "/O" to it. Some possible root words that fit this criteria include:
1. STOMAT/O - pertaining to the mouth or an opening
2. CARDI/O - pertaining to the heart or a passage
3. TRACHE/O - pertaining to the windpipe or a duct
Therefore, the missing word could be "STOMAT/O," "CARDI/O," or "TRACHE/O," depending on the context or specific information provided.