Definition of Müller-Lyer in US English:

Müller-Lyer

(also Muller-Lyer)

noun

  • 1Attributive and in the genitive. Designating or relating to an optical illusion in which a line with a V-shaped arrowhead pointing outward at each end appears shorter than an adjacent line of equal length with the V-shaped arrowheads pointing inwards.

  • 2The Müller-Lyer illusion.

Origin

Late 19th century; earliest use found in The Philosophical Review. From the name of Franz Carl Müller-Lyer, German sociologist and psychiatrist, who described the phenomenon in Arch. f. Anat. u. Physiol.: Physiol. Abth Suppl. 263–70.

Pronunciation

Müller-Lyer

/ˌmʊləˈlʌɪə/