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Then we could have retronym, meaning a word formed by reversing the spelling of another word.— VERBATIM: The Language Quarterly Vol XXIII No 4
The term Rāja Yoga is a retronym, introduced in the 15th-century Hatha Yoga Pradipika to distinguish the school based on the Yoga Sutras of Patanjali from the more current school of Hatha Yoga expounded by Swami Swatmarama.— Yahoo! Answers: Latest Questions
The current term for this sort of thing is retronym.— RPGamer
Retronym has been looked up 254 times, favorited 4 times, listed 31 times, and commented on 0 times.

American Heritage Dictionary (1)
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