anatiferous

Etymology
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Adjective

 * 1)  Producing ducks. Formerly used of barnacles, since it was believed that they produced ducks and geese.
 * 2) * 1646, Pseudodoxia Epidemica, Thomas Browne, Book III:
 * [I]f there be anatiferous trees, whoſe corruption breaks forth into Bernacles, yet if they corrupt, they degenerate into maggots, which not produce them again.