The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
dail-
DEFINITION:
To divide. Northern Indo-European root extended from *da()i- (see d-). 1.deal1, from Old English dlan, to share, from Germanic *dailjan.2a.dole1, from Old English dl, portion, lot; b.filler2, from Old High German teil, part. Both a and b from Germanic *dailaz.3.ordeal, from Old English ordl, trial by ordeal, from Germanic prefixed form *uz-dailjam, a portioning out, judgment (*uz-, out; see ud-). 4.firkin, from Middle Dutch deel, part, from Germanic *dailiz. (In Pokorny d : d- 175.)