Eight (āt), n. [See Ait.] An island in a river; an ait. [Obs.] “Osiers on their eights.” Evelyn.
[1913 Webster]

Eight (āt), n. 1. The number greater by a unit than seven; eight units or objects.
[1913 Webster]

2. A symbol representing eight units, as 8 or viii.
[1913 Webster]