Dictionary.net

• A black, two-horned, African rhinoceros (Atelodus keitloa). It has the posterior horn about as long as the anterior one, or even longer.

2010 - New Age Dictionary Database
By Oddity Software

• A black, two-horned, African rhinoceros (Atelodus keitloa). It has the posterior horn about as long as the anterior one, or even longer.

1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.