• synonyms

Masson disk

[mas-uh n]
See more synonyms for Masson disk on Thesaurus.com
  1. 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.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018