/aytth, ayth/ , adj.
1. next after the seventh.
2. being one of eight equal parts.
n.
3. an eighth part, esp. of one ( 1 / 8 ).
4. the eighth member of a series.
5. Music. octave.
adv.
6. in the eighth place; eighthly.
[ bef. 1000; ME eightethe, OE eahtotha; c. OHG ahtoda, ON attandi, Goth ahtud-. See EIGHT, -TH 2 ]