We found one dictionary that defines the word either a or b but notboth:

Miscellaneous (1 matching dictionary)

1. Encyclopedia of Graphic Symbols (No longer online)

▸ Words similar to either a or b but notboth ▸ Usage examples for either a or b but notboth ▸ Idioms related to either a or b but notboth ▸ Wikipedia articles (New!) ▸ Words that often appear near either a or b but notboth ▸ Rhymes of either a or b but notboth ▸ Invented words related to either a or b but notboth