isogram
Definition - A word that has either no repeating letters (e.g. ambidextrously) or in which all the letters appear twice (e.g. deed).

Notes:
1. Isograms in which each letter appears just once are called first-order isograms. Those where each letter appears twice are called either second-order isograms or pair isograms.

Etymology -
The term was coined by Dmitri Borgmann in his book Language on Vacation: An Olio of Orthographical Oddities (Scribner, 1965)


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