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Question 1 of 9
You may have read the word "simmer" in a recipe or two, but what does it really mean?

Origin of optical illusion

First recorded in 1785–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for optical illusion

British Dictionary definitions for optical illusion

optical illusion

noun

an object causing a false visual impression
an instance of deception by such an object
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012