bill of health

noun
1.
a certificate, carried by a ship, attesting to the presence or absence of infectious diseases among the ship's crew and at the port from which it has come.
Idioms
2.
clean bill of health, an attestation of fitness or qualification; a commendation: The investigating committee gave him a clean bill of health.

Origin:
1635–45

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World English Dictionary
bill of health
 
n
1.  a certificate, issued by a port officer, that attests to the health of a ship's company
2.  informal clean bill of health
 a.  a good report of one's physical condition
 b.  a favourable account of a person's or a company's financial position

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

bill of health n.

  1. A certificate stating whether there is infectious disease aboard a ship or in a port of departure, given to the ship's master to present at the next port of arrival.

  2. An attestation as to condition, especially a favorable one.

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
Researchers don't know what fetal cells are doing in tumors, but they aren't
  prepared to give the cells a clean bill of health.
Foreign observers are expected to give the vote a clean bill of health.
More padding-in the form of cash in the bank-will be necessary to secure a
  clean bill of health.
There could be a big shift if one of these were to be given a clean bill of
  health.
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