thumb duplication - congenital hand differences - Boston Children's Hospital
syndactyly - congenital hand differences - Boston Children's Hospital
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Polydactyly (hexadactyly) - Medical Meaning and Pronunciation
Polydactyly or polydactylism, also known as hyperdactyly, is a congenital physical anomaly in humans and animals resulting in supernumerary fingers and/or toes. Polydactyly is the opposite of oligodactyly.