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propositus

[pruh-poz-i-tuh s]
noun, plural pro·pos·i·ti [pruh-poz-i-tahy] /prəˈpɒz ɪˌtaɪ/.
  1. Law. the person from whom a line of descent is derived on a genealogical table.
  2. Genetics. proband.
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Origin of propositus

1925–30; < New Latin, special use of past participle of Latin prōpōnere to set forth, propound
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for propositus

propositus

feminine proposita (prəˈpɒzɪtə)

noun plural -ti (-ˌtaɪ) or feminine -tae (-tiː)
  1. law the person from whom a line of descent is traced
  2. Also called (esp US): proband med the first patient to be investigated in a family study, to whom all relationships are referred
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Word Origin

from New Latin, from Latin prōpōnere to set forth; see propound
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

propositus in Medicine

propositus

(prō-pŏzĭ-təs)
n. pl. pro•pos•i•ti (-tī′)
  1. proband
  2. A premise; an argument.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.