1. Acting as or providing a complement (something that completes the whole)
   - complementary, completing

See also: additive, complement

• Cockaigne
• cockamamie
• cockamamy
• cockateel
• cockatiel
• cockatoo
• cockatoo parrot
• cockatrice
• cockchafer
• Cockcroft
• Cockcroft and Walton accelerator
• Cockcroft and Walton voltage multiplier
• Cockcroft-Walton accelerator
• Cockcroft-Walton voltage multiplier
• cockcrow
• cocked hat
• cocker
• cocker spaniel
• cockerel
• cockeyed
• cockfight
• cockfighting
• cockhorse
• cockiness
• cockle