catabasis /kə-tabˈə-sis/

1. A downward movement
2. The decline of a disease in a population

• squabbling
• rubidiums
• rubidium-strontium dating
• rubied
• rubier
• rubies
• rubiest
• rubified
• rubify
• rubifying
• rubiginose
• rubiginous
• Rubik's Cube
• rub in
• rubin
• rubine
• rubineous
• rubines
• rubins
• rubious
• ruble
• rubles
• rub off on
• rub off on to
• rub of the green