For anyone confused.

Most other languages do call it a thermo meter or similar. People who are not native English speakers will pronounce it wrongly when speaking English, because the word is the same - it's just pronounced weirdly in both British and American English. The British and American pronunciations are not exactly the same on this, but they're both ~~wrong~~ different from any other languages, except Greek.

The English pronunciation is caused by English inheriting the Greek way of stressing the third last syllable on words of Greek origin. It makes no sense in my mind why they do it on compound words though. Meter is not Greek. It's English, so they could've chosen differently, but they obviously chose the most annoying way to pronounce it.

There's a few other words like that, but I don't remember which..

I like to do that with a lot of the o'meters, just for fun.

Acceler-o-meter and seis-o-meter are my favorite. Weirdly least fun: kil-o-meter.

and what the teacher did?