EWTN Catholic Q&A
Larry's Question on Latin Pronunciation
Question from PJ on 01-30-2014:

Your answer is not quite correct. The pronunciation of the word "Excelsis" in what is commonly referred to as Church Latin, would be "ex chell sees". The "ce" combination is pronounced as a soft c not a hard c.

Answer by Richard Geraghty on 02-16-2014:

Dear PJ.

Thank you for your note.

Dear PJ,

Thank you for your note.

Dr. Geraghty