underweight

underweight definition - medical

un·der·weight (ŭnˈdər-wātˌ)

adjective
Weighing less than is normal, healthy, or required.
noun
Insufficiency of weight.

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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