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

• posset cups
• posseted
• posseting
• possets
• possibilism
• possibilisms
• possibilist
• possibilists
• possibilities
• possibility
• possible
• possibles
• possibly
• possie
• possies
• possing
• poss-stick
• 'possum
• possum
• Possum
• 'possumed
• possumed
• 'possuming
• possuming
• 'possums