1. Straight up or down without a break
   - sheer, orthogonally 
2. In a perpendicular manner
   "this red line runs perpendicularly to the green line"
   - orthogonally

See also: perpendicular

• Cheiranthus cheiri
• Chekhov
• Chekov
• chela
• chelate
• chelate compound
• chelated
• chelation
• chelicera
• cheliceral
• Chelicerata
• chelicerate
• chelicerous
• Chelidonium
• Chelidonium majus
• Chelifer
• Chelifer cancroides
• cheliferous
• cheloid
• Chelone
• Chelone glabra
• Chelonethida
• Chelonia
• Chelonia mydas
• chelonian