simian crease

noun

simian crease

noun

Etymology So called because it resembles the usual condition of non-human simians.

Anatomy, Medicine, Pathology, Sciences A crease that extends across the palm of the human hand, formed by the fusion of the two palmar creases, found especially in people with Down syndrome.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.