RAY Copy link • RAYA beam of light, radius luminis: lumen: lux [SYN. in LIGHT]: a ray of hope beamed forth, lux quaedam videbatur oblata (Cic.); lux venisse quaedam et spes videbatur (ib.); lux quaedam affulsisse (civitati) visa est (Liv.). A kind of fish, raia (Plin.).