cofactor /kō-fakˈtər/

1. A factor which occurs along with other factors in multiplication
2. A nonprotein organic molecule or a metallic ion that binds with an enzyme and is essential to the enzyme's activity (biology)

• runcible
• runcinate
• run close
• run counter to
• rund
• rundale
• rundales
• rundle
• rundled
• rundles
• rundlet
• rundlets
• run down
• run-down
• rundown
• run-downs
• run dry
• runds
• rune
• runecraft
• runecrafts
• runed
• run errands
• runes
• rune-singer