13-letter words containing b, u, s, y
- vitreous body — a transparent gelatinous substance, permeated by fine fibrils, that fills the interior of the eyeball between the lens and the retina
- west by south — a point on the compass 11°15prime; south of west. Abbreviation: WbS.
- x-ray burster — a celestial source from which bursts of x-rays are received.