An Etymological Dictionary of Astronomy and Astrophysics

1. Sending out rays of light; bright; shining.
   
   See also: → radiant energy, → radiant flux, → radiant intensity.
   

2. The point in the sky from which → meteors
   in a → meteor shower appear to radiate or come. See also: → radiant drift.

Etymology (EN): M.E., from M.Fr. radiant, from L. radiantem (nominative radians) “shining,” pr.p. of radiare “to shine, radiate,” → radiation.

Etymology (PE): 1) Tâbandé, tâbeši adj. from tâbidan,
→ radiate.
2) Tâbsar, from tâb “light, radiation,” → radiation,

• sar “head, top, summit, point,” → head.