4 occurrences in 4 dictionaries
Reference: Ader
Smith
A'der
(flock), a Benjamites, son of Beriah, chief of the inhabitants of Aijalon.
The name is more correctly Eder.
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Watsons
ADER. Jerom observes, that the place where the angels declared the birth of Jesus Christ to the shepherds, was called by this name, Lu 2:8-9. The empress Helena built a church on this spot, the remains of which are still visible.