We found one dictionary that defines the word missubtract:

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1. missubtract: Wiktionary

Definitions from Wiktionary (missubtract) ▸ verb:  To subtract incorrectly. ▸ Words similar to missubtract ▸ Usage examples for missubtract ▸ Idioms related to missubtract ▸ Wikipedia articles (New!) ▸ Words that often appear near missubtract ▸ Rhymes of missubtract ▸ Invented words related to missubtract