ectrosyndactyly

Congenital abnormality marked by the absence of one or more digits and the fusion of others. [ectro- + G. syn, together, + daktylos, finger]

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ec·tro·syn·dac·ty·ly (ek″tro-sin-dakґtə-le) [ectro- + syndactyly] a condition in which some of the digits are missing and those that remain are webbed, so that they are more or less attached.