penumbra /pe-numˈbrə/

1. A partial or lighter shadow round the perfect or darker shadow produced by an eclipse or by a large unfocused light source shining on an opaque object
2. The less dark border of a sunspot or any similar spot
3. The part of a picture where the light and shade blend into each other

• sectorisations
• sectorise
• sectorised
• sectorises
• sectorising
• sectorization
• sieve-like
• sieve of Eratosthenes
• sieve plate
• sieve plates
• sievert
• sieverts
• sieves
• sieve tube
• sieve tubes
• sieving
• sifaka
• sifakas
• siffle
• siffled
• siffles
• siffleur
• siffleurs
• siffleuse
• siffleuses