a. (sb.) Also 4 eiȝtithe, 6 eyghteth. [f. EIGHTY: see -TH.] The ordinal numeral answering to the cardinal eighty.
1382. Wyclif, 2 Macc. i. 10. In the hundred ȝeer and eiȝte and eiȝtithe.
1530. Palsgr., 372. Octantiesme, eyghteth.
1867. Denison, Astron. without Math., 176. Our moon is nearly one eightieth of the earth.
