proband

[proh-band]
noun Genetics.
a patient who is the initial member of a family to come under study.
Also called propositus.


Origin:
1925–30; < Latin probandus, gerundive of probāre to test, probe

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World English Dictionary
proband (ˈprəʊbænd)
 
n
another name (esp US) for propositus
 
[C20: from Latin probandus, gerundive of probāre to test]

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

proband pro·band (prō'bānd')
n.
An individual or member of a family being studied in a genetic investigation. Also called index case, propositus.

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
The brothers and sisters of the proband are called siblings.
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