un·der·weight

[adj. uhn-der-weyt; n. uhn-der-weyt]
adjective
1.
weighing less than is usual, required, or proper.
noun
2.
deficiency in weight below a standard or requirement.

Origin:
1590–1600; under- + weight

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
underweight (ˌʌndəˈweɪt) [Click for IPA pronunciation guide]
 
adj
1.  weighing less than is average, expected, or healthy
2.  finance
 a.  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
 b.  (of a fund etc) disproportionately invested in this way: pension funds have become underweight of equities

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Underweight is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Etymonline
Word Origin & History

underweight
1899, from under- + weight.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Example sentences
If someone older is underweight, that can be of concern.
The red blood cell count is normal or close to normal, and the patient is not underweight.
Other bats in the same caves were found to be severely underweight.
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