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So a dilemna would be an abundance of duckweed. It would be hard for a duck to figure out which weed to eat first. He would be hesitant, indecisive. He might find himself in a dilemna. Problem solved...
It may simply be confusing it with words like calumny, autumn, damnation, alumni, which have the "mn" construction. The original greek goes back to lemma - so no n there either.