1. [n]  the cardinal number that is the product of ten and eight
2. [adj]  being ten more than seventy

EIGHTY is a 6 letter word that starts with E.

1. \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.
   
   

2. \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.