Just that really, my DD was doing descriptive writing at school about a fire. She wrote about "acrid" smoke and her teacher hadn't heard of the word and had to look it up. My DH hadn't heard of it either. It surprised me as I didn't think it was a particularly unknown word but now I'm doubting myself! So I just wanted a hive mind poll to see whether it's a word generally known or not.
YABU - It isn't a word I've come across before.
YANBU - I know what acrid means.