Definitions

1. noun

A disease of horses in which the inside of the horse’s mouth turns black due to the death of tissue.

“The veterinarian diagnosed the horse with blacktongue and prescribed a course of antibiotics.”

2. noun

A fungal disease affecting the mouth of horses, also known as black tongue disease or black tongue.

“The horse owner was warned that blacktongue is contagious and can spread to other animals.”