An isogram is a word in which no letter is repeated. These three
words are each one letter short of the record-holders, "dermatoglyphics"
Brachypolemius Wittmer, 1950 (beetle)
Schizotrypanum (subgenus of trypanosome)
In pair isograms, each letter occurs exactly twice.
Taeniodontidae (lower Eocene edentate)
Callictita (lycaenid butterfly)
Cercartetus nanus (eastern pygmy possum)
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