From BiblePortal Wikipedia

Fausset's Bible Dictionary [1]

Round and hollow. Babylonian bowls are to be seen in the British Museum, with Chaldean inscriptions, probably designed as charms against evil and sickness (compare Joseph's "divining cup,"  Genesis 44:5). The writing is of a Hebrew type, and may have belonged to the descendants of the Jewish captives in Babylon.

Webster's Dictionary [2]

(n. pl.) See Bowl, a ball, a game.