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heterodactylism

noun
het·​ero·​dac·​ty·​lism | \-təˌlizəm\
plural -s

Definition of heterodactylism 

1 : unilateral polydactylism

2 : a greater degree of polydactylism on one side than on the other

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History and Etymology for heterodactylism

heter- + -dactylism

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