Eighty \Eight"y\, a. [AS. eahtatig, where the ending -tig is akin to English ten; cf. G. achtzig. See Eight, and Ten.] Eight times ten; fourscore.
Source: Webster's Revised Unabridged Dictionary (1913)
Eighty \Eight"y\, n.1. The sum of eight times ten; eighty units or objects.
2. A symbol representing eighty units, or ten eight times repeated, as 80 or lxxx.