From Wiktionary, the free dictionary
From сис (sis, “spine, backbone”) + быа (bıa, “belt”).
сис быата • (sis bıata)
- cross-saddle belt, saddle strap (for a horse)
- Holonym: ыҥыыр (ıñıır, “saddle”)
- Russian чересседельник (čeressedelʹnik) (the page does not currently exist, but is listed under черес- (čeres-) and седло (sedlo))