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Definition of eighth:
Synonyms:
eleventh, fifteenth, 8th, ordinal, denominator, oneeighth, billionth, common fraction, and, fortieth, common denominator, fourteenth, fourth, fiftieth.
Usage examples:

" I am lost, I do not possess the eighth part of that sum!
 "Old Fritz and the New Era", Louise Muhlbach. 
What is the effect of repeating the words to day and to morrow, in the fourth and eighth lines of each stanza?
 "New National Fourth Reader", Charles J. Barnes and J. Marshall Hawkes. 
It measures thirteen inches one eighth, by nine inches.
 "A Bibliographical, Antiquarian and Picturesque Tour in France and Germany, Volume Two", Thomas Frognall Dibdin.