1. Inability to see the colour blue or to distinguish the colours blue and yellow
   - tritanopic

See also: blind, blue-blindness, unsighted

• red laver
• red lead
• red light
• red man
• red maple
• red marrow
• red meat
• red morning-glory
• red mulberry
• red mullet
• Red Notice
• red oak
• red onion
• red osier
• red osier dogwood
• red panda
• red pepper
• red periwinkle
• red phalarope
• red pimpernel
• red pine
• Red Planet
• red porgy
• red raspberry
• red rat snake