Final answer:
The syllable 'Di' in 'audiologist' is stressed when pronounced.
Step-by-step explanation:
The syllable in "audiologist" that receives the emphasis when pronounced is "Di". This is consistent with the patterns often found in English where stress can often fall on the second syllable, especially in longer words.
In the case of the word audiologist, while the prefix 'audio-' is important, it is the 'di' syllable that carries the primary stress in American English pronunciation.