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invalid definition - medical

in·va·lid (ĭnˈvə-lĭd)

noun
One who is incapacitated by a chronic illness or disability.
adjective
Incapacitated by illness or injury.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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