The Collaborative International Dictionary of English v.0.48:
Leucoryx \Leu"co*ryx\ (l[=u]"k[-o]*r[i^]ks), n. [NL., from Gr. leyko`s + 'o`ryx a kind of gazelle.] (Zool.) A large antelope of North Africa (Oryx leucoryx), allied to the gemsbok. [1913 Webster]