We found one dictionary that defines the word right-handiness:

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1. right-handiness: Wiktionary

Definitions from Wiktionary (right-handiness) ▸ noun:  (archaic) Right-handedness. ▸ Words similar to right-handiness ▸ Usage examples for right-handiness ▸ Idioms related to right-handiness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing right-handiness ▸ Words that often appear near right-handiness ▸ Rhymes of right-handiness ▸ Invented words related to right-handiness