backronym

• bacronym

Blend of back +‎ acronym.

• IPA^(key): /ˈbæk.ɹəˌnɪm/

backronym (plural backronyms)

1. A word that is either not an acronym but is taken to be one and for which a full form is invented by back-formation, or is an acronym and for which an alternative full form is invented by back-formation.
   • 2018 March 14, Sarah Lewin, "Meet ‘Steve,’ the Aurora-Like Mystery Scientists Are Beginning to Unravel," space.com (retrieved 17 March 2018):

     [T]he phenomenon has been dubbed STEVE, a backronym that matches the name originally given by aurora watchers. (STEVE is short for "Strong Thermal Emission Velocity Enhancement.")

• backronymic

• recursive acronym

backronym (third-person singular simple present backronyms, present participle backronyming, simple past and past participle backronymed)

1. To create a backronym.

• backronym on Wikipedia.Wikipedia
• “backronym” (US) / “backronym” (UK) in Oxford Dictionaries, Oxford University Press.