horn
n. countable C1 Advanced Oxford US //ˈhɔɹn// UK //hˈɔːn// horn
n. a hard, pointed part on the head of animals like cows or goats. It can also mean a device on a car that makes a loud noise to warn people.
n. a permanent, pointed projection on the head of various mammals, consisting of a keratin sheath over a bony core. Also refers to a device used to produce a loud warning signal.
The driver honked his horn to warn the pedestrian.
The farmer noticed that one goat had a broken horn after the animals fought in the field.
While the rhinoceros is famous for its horn, the material is actually composed of densely packed keratin rather than the true bone found in bovine species.
Usage
Often used metaphorically in the phrase 'to blow one's own horn' to mean boasting about achievements.