pentadactyly in English dictionary pentadactyly Meanings and definitions of "pentadactyly" The condition of having five digits (fingers or toes) on a limb. noun The condition of having five digits (fingers or toes) on a limb. more Grammar and declension of pentadactyly pentadactyly ( uncountable) pentadactyly (uncountable) more Sample sentences with "pentadactyly" Declension Stem Try again Authors