EIGHTHLY
Etymology
Adverb
eighthly (not comparable)
In the eighth place; eighth in a row.
Source: Wiktionary
Eighth"ly, adv.
Definition: As the eighth in order.
EIGHTH
Eighth, a. Etym: [AS. eahto.]
1. Next in order after the seventh.
2. Consisting of one of eight equal divisions of a thing. Eighth note
(Mus.), the eighth part of a whole note, or semibreve; a quaver.
Eighth, n.
1. The quotient of a unit divided by eight; one of eight equal parts;
an eighth part.
2. (Mus.)
Definition: The interval of an octave.
Source: Webster’s Unabridged Dictionary 1913 Edition