• The innermost or first digit on the hind foot of certain mammals. The human hallux is commonly called the big toe.
  • A homologous digit of a bird, reptile, or amphibian. In birds, it is often directed backward.
  • The innermost of the five digits which normally compose the hind foot of air-breathing vertebrates; in man, the great toe. See cut under <internalXref urlencoded="foot">foot</internalXref>.
  • The first, or preaxial, digit of the hind limb, corresponding to the pollux in the fore limb; the great toe; the hind toe of birds.
  • The <xref>big toe</xref>
  • the first largest innermost toe
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