IPA: /ˈhɔrnɪst/
KK: /hɔrnɪst/
A person who plays a musical instrument called the horn, often a French horn.
The hornist performed beautifully at the concert last night.
Hornist → It is formed from "horn" (from Old English "horn", meaning a hard, pointed projection) and "-ist" (meaning a person who practices or is concerned with). A hornist is a person who plays the horn, an instrument that is a hard, pointed projection used to produce music.
Think of someone who plays a 'horn' — the '-ist' just means a person who practices that art. A hornist is simply a person who plays the horn.