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

penumˈbral adjective

• synchronises
• synchronising
• synchronism
• synchronisms
• synchronistic
• synchronistical
• synchronistically
• synchronization
• synchronize
• synchronized
• synchronized swimming
• synchronizer
• synchronizers
• synchronizes
• synchronizing
• synchronologies
• synchronology
• synchronous
• synchronously
• synchronous motor
• synchronous motors
• synchronousness
• synchronousnesses
• synchronous orbit
• synchronous orbits