noun (plural halluces /ˈhaljʊsiːz/ /ˈhaləsiːz/)
1 Anatomy A person’s big toe.
- A hallux digital pressure is considered normal at 50 mm Hg; values of 30 mm Hg or lower are indicative of a significant decease in peripheral perfusion.
- The different areas were the medial and lateral heel; the medial and lateral midfoot; the medial, central, and lateral forefoot; the hallux; the second toe; and the lateral toes.
- Chen et al. measured peak pressures under the heel, the medial forefoot, and the hallux of 290 kPa, 390 kPa, and 380 kPa.
1.1 Zoology The innermost digit of the hind foot of vertebrates.
- They have an opposable hallux on their hind feet, and their pelage is soft, thick, and wooly.
- Arnold says that ‘some birds, such as gulls, lose the external hallux entirely,’ yet all gulls have an external hallux, although it is very reduced in the two species of kittiwakes.
- Most of the fossil tracks show three slender toes tipped by small claws, but some also bear the imprint of a small, rear-facing toe called a hallux.
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