Müller-Lyer illusion

[muhl-er-lahy-er, myoo-ler-, mil-er-; Ger. myl-uhr-lee-uhr]

Müller-Lyer illusion

[muhl-er-lahy-er, myoo-ler-, mil-er-; Ger. myl-uhr-lee-uhr]
noun
a geometric illusion in which two lines of equal length appear unequal depending on whether angular lines forming arrowheads at each end point toward or away from each other.

Origin:
after Franz-Karl Müller-Lyer (1857–1916), German sociologist, who described the illusion in 1889
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Müller-lyer illusion is always a great word to know.
So is callithumpian. Does it mean:
a fool or simpleton; ninny.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
World English Dictionary
Müller-Lyer illusion (ˈmuːləˈlaɪə)
 
n
an optical illusion in which a line with inward pointing arrowheads is seen as longer than an equal line with outward pointing arrowheads
 
[C19: named after Franz Müller-Lyer (1857--1916), German sociologist and psychiatrist]

Collins English Dictionary - Complete & Unabridged 10th Edition
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