Final answer:
The PubMed feature used to identify search terms when the original term does not yield enough results is the MeSH Database. This tool allows for the refinement of search strategies and can be supplemented with Boolean Operators for more precise results.
Step-by-step explanation:
The feature in PubMed which can be used to identify search terms when the original term does not yield enough results is the MeSH Database. The MeSH (Medical Subject Headings) Database allows users to find terms that are related to their initial keywords, offering a way to adjust and refine search strategies to get more comprehensive results. This is particularly useful when the initial keyword is too specific or not yielding sufficient search outcomes.
Using the MeSH Database effectively can lead to identifying additional, relevant terms, which can be combined with original search criteria using Boolean Operators such as AND, OR, and NOT, to further tailor the search results. These operators help to either narrow down the results by requiring that all search terms be present (AND), expand the search to include any of the listed terms (OR), or exclude certain terms from the search (NOT).