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underweight

[adj. uhn-der-weyt; n. uhn-der-weyt] /adj. ˈʌn dərˈweɪt; n. ˈʌn dərˌweɪt/
adjective
1.
weighing less than is usual, required, or proper.
noun
2.
deficiency in weight below a standard or requirement.
Origin
1590-1600
1590-1600; under- + weight
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for underweight
  • If someone older is underweight, that can be of concern.
  • Other bats in the same caves were found to be severely underweight.
  • The red blood cell count is normal or close to normal, and the patient is not underweight.
British Dictionary definitions for underweight

underweight

/ˌʌndəˈweɪt/
adjective
1.
weighing less than is average, expected, or healthy
2.
(finance)
  1. having a lower proportion of one's investments in a particular sector of the market than the size of that sector relative to the total market would suggest
  2. (of a fund etc) disproportionately invested in this way: pension funds have become underweight of equities
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
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Word Origin and History for underweight
adj.

1899, from under- + weight.

Online Etymology Dictionary, © 2010 Douglas Harper
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underweight in Medicine

underweight un·der·weight (ŭn'dər-wāt')
adj.
Weighing less than is normal, healthy, or required. n.
Insufficiency of weight.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Word Value for underweight

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