What is "rheeboc"

Reebok \Ree"bok`\ (r?"b?k`), n. [D., literally, roebuck.] (Zo["o]l.) The peele. [Written also rehboc and rheeboc.]

Peele \Pee"le\, n. (Zo["o]l.) A graceful and swift South African antelope ( Pelea capreola). The hair is woolly, and ash-gray on the back and sides. The horns are black, long, slender, straight, nearly smooth, and very sharp. Called also rheeboc, and rehboc.