An Etymological Dictionary of Astronomy and Astrophysics

1. The moon at → opposition, when it appears as a round disk to an observer on the Earth because the illuminated side is toward him.
   

2. The phase when the → age of the moon, measured from → new moon, is 14.5 days.

Etymology (EN): → full; → moon.

Etymology (PE): Pormâh, from Mid.Pers. purrmâh, from Av. pərənô.manha- “full moon” (cf. Skt. pūrná-mās-);
→ full; → moon.