お八つ

Etymology
Compound of. Times in the old Japanese timekeeping system were labelled using either the animals of the Chinese zodiac or numbers ranging from 4 to 9. The time when were eaten was labelled using the number 8, as.

First cited to a text from 1688.

Noun

 * 1)   in the old timekeeping system, the period of roughly 2:00 until 4:00, both AM and PM
 * 2)   a snack eaten at around 3:00 pm
 * 3)  a snack between meals
 * 1)  a snack between meals