Glossary
Fingers Identified By Roman Numerals

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Pentadactyl
Having five digits (fingers, toes) on a limb.
Pentadactyly is the condition of having five digits on each limb. It is, to an extent, still taken to be the archetypal dactyly for tetrapods (four-footed animals), from which subsequent modifications have been made.
Cf.
Tetradactyl
Tridactyl
Didactyl
Monodactyl