Müller-Lyer illusion noun phr. [mʊlǝ'lʌɪǝr ɪ,l(j)u:ʒ(ǝ)n] L19.
[F. C. Müller-Lyer (1857-1916), German sociologist and philosopher.]
An optical illusion in which a line with an arrowhead pointing outwards at each end appears shorter than one of equal length with the arrowheads pointing inwards.

[TahlilGaran] English Dictionary ▲