1eighth 
/ˈeɪtθ/ noun
plural eighths /ˈeɪtθ/ noun 1 [singular] : number eight in a series
▪ My appointment is on the eighth (of the month). 2 [count] : one of eight equal parts of something
▪ one eighth of the pie ▪ An eighth of a pound is two ounces.
▪ My appointment is on the eighth (of the month).
▪ one eighth of the pie ▪ An eighth of a pound is two ounces.
