• (n.) A black, two-horned, African rhinoceros (Atelodus keitloa). It has the posterior horn about as long as the anterior one, or even longer.
Keit·lo'a noun [ Native name.] (Zoology) A black, two-horned, African rhinoceros ( Atelodus keitloa ). It has the posterior horn about as long as the anterior one, or even longer. 
a variety of the black rhinoceros having the posterior horn equal to or longer than the anterior horn.