|Easton's Bible Dictionary|
Both the name and its explanation, "a half shekel," are given in Exodus 38:26. The word properly means a "division," a "part." (R.V., "beka.")
Noah Webster's Dictionary
(n.) Half a shekel.
Bekah (1 Occurrence)
Genesis 24:22 And it cometh to pass when the camels have finished drinking, that the man taketh a golden ring (whose weight 'is' a bekah), and two bracelets for her hands (whose weight 'is' ten 'bekahs' of gold), (YLT)