Surplice, Ad orientem

Surplice is English. "sur-plus" or "sur-plis" (the latter is more British, but some Americans say it that way too)

The Latin is superpelliceum

sue-pear-pel- lee - chay- oom

Ad orientem

add Oh-ree-en-tem

This is a good explanation

https://www.ewtn.com/expert/answers/ecc ... _latin.htm

Thank you. And for the Ad orientem, the Ad part is pronounced with a as in father, like in the other words, right?

Right. Maybe my poor attempt at pseudo-phonetic spelling should have been odd rather than add (the a in the word add being different

Usually, it is "uh" for the short and "ar" for the long versions of "a as in father".

I don't pronounce Latin the Italian way, and I like to write macrons over vowels.

I also can write "short" accents over vowels, too.

According to the generic "Italianate" Latin pronunciation (like what was given in the EWTN guide), vowel length is not generally observed, except to determine stress accent. Vowel quantity is almost always the same regardless of context (e.g., A is always like in "father," never as in "bat" or "Virginia").

I was assuming Ecclesiatical pronunciation, modo Romano, which is what is given by the Liber usualis, which is where EWTN got that guide from. That manner of pronunciation was urged to and requested of all Catholics in the liturgy under Benedict XV

There is also a Germanic ecclesiatical pronunciation (compare vinci vin-chi versus vin-tzi) and a few others, just as before pseudo-classical was invented by German scholars pronunciation in academic circles varied widely (