diesis /dīˈi-sis/

1. A tiny difference in pitch, the difference between the sum of four minor thirds and an octave (great diesis) or three major thirds and an octave (enharmonic diesis) (music)
2. The double dagger (‡), used to indicate a reference (printing)

• blue-pencilling
• blue pencils
• blue-pencils
• Blue Peter
• blue pipe-tree
• blue pointer
• blue pointers
• blue poppy
• blueprint
• blueprinted
• blueprinting
• blueprints
• blue quandong
• bluer
• blue riband
• blue ribands
• blue ribbon
• Blue Ribbon Army
• blue ribbons
• blue rinse
• blue-rinse
• blue-rinsed
• blue rinsers
• blue rinses
• blue rocket