noun C1 Latin origin penumbra /pəˈnʌm.brə/  ·  puh-NUM-bra نیم سایہمجھول سایہنصف سایہ Roman Urdu: Nim Saya ENGLISH MEANING The partially shaded outer region of a shadow. Penumbra refers to the area where only part of the light source is blocked, producing a faint shadow. It is commonly used in astronomy during eclipses, but can also[...]