Should one cite a dictionary for every technical term?
It depends on your target audience. If they are familiar with that medical topic, then it's not necessary.

Even if they are not familiar, citing dictionary is an inconvenient way to do it because i) the readers need to stop reading and get that dictionary, ii) most people who are not familiar with medical terms probably would not have easy access to a medical dictionary. For this reason, I will recommend having a glossary list/table or providing minimal but sufficient in-text definition. The list/table method is better for mixed audience so that the more technically inclined can read on without any problem; the in-text definition method is more suitable for generally less technically inclined audience.

I don't think you need to refer down to the page number and have multiple citations when you cite them. Dictionary is built in a way that you can find the word without page number. And if you use a list/table, then a combination of superscript symbol and a blanket citation in the footnote is also a convenient to deal with it.

In any case, seek out other similar reports or talk to the editor on how to deal with your problem. They would reveal perhaps the most common or best practices.