octingenary /ok-tin-jēˈnə-ri/ or octingentenary /-jen-tēˈnə-ri/

An eight-hundredth anniversary

• hygienics
• hygienist
• hygienists
• hygristor
• hygristors
• hygro-
• hygrochasies
• hygrochastic
• hygrochasy
• hygrodeik
• hygrodeiks
• hygrograph
• hygrographic
• hygrographical
• hygrographs
• hygrologies
• hygrology
• hygrometer
• hygrometers
• hygrometric
• hygrometrical
• hygrometries
• hygrometry
• hygrophil
• hygrophilous