From an unused root (meaning to flow down or together as drops); a reservoir -- drop.
H96. egel
אֵ֫גֶל noun [masculine] usually transitive drop, אֶגְלֵיטָֿ֑ל dew-drops Job 38:28 ("" מָטָר) so Vrss De Di; Hoffm 'Rückstände,' 'Ansammlungen,' i.e. collections, stores, reserve-supply.