Relating to or characterized by having six digits, fingers, or toes on each limb.
From Greek 'hex-' (six) + 'daktylos' (finger) + '-ic' (relating to). This became a standard anatomical descriptor in the 18th and 19th centuries as zoologists categorized animal body plans.
Most vertebrates are actually pentadactyl (five digits), but studying hexadactylic or polydactyl variants helps evolutionary biologists understand how body plans change over millions of years.
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