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Masson disk

[ mas-uhn ]
/ ˈmæs ən /
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noun
a white disk on which a series of concentric gray circles appear to vanish intermittently when the disk is rotated, used for testing a person's fluctuation of attention and visual threshold.
QUIZ
QUIZ YOURSELF ON "IS" VS. "ARE"
"Is" it time for a new quiz? "Are" you ready? Then prove your excellent skills on using "is" vs. "are."
Question 1 of 7
IS and ARE are both forms of which verb?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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