@caseyliss At this point, both are in use, but the short “I” is correct. The root (see what I did there) word is from latin, so it maintains the latin stress, hence tin-ih-tus. In a bit of fun, the first written use of the word we have is from Pliny The Elder. Also… don’t do any of the things he suggests to cure it.

@caseyliss The American pronunciation in my work that really bothers me: Tinnitus (Should be tin-ih-tus not tin-ay-tus or /ˈtɪnɪtəs/ if you want the IPA).