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-trix

1.
a suffix occurring in loanwords from Latin, where it formed feminine nouns or adjectives corresponding to agent nouns ending in -tor, (Bellatrix). On this model, -trix, is used in English to form feminine nouns (aviatrix; executrix) and geometrical terms denoting straight lines (directrix).
Also, -trice.
Origin
< Latin -trīx, stem -trīc-
Usage note
A suffix borrowed directly from Latin, -trix has been used since the 15th century on feminine agent nouns that correspond to a masculine (in Latin) or generic (in English) agent noun ending in -tor: aviator, aviatrix; legislator, legislatrix; orator, oratrix. Most nouns in -trix have dropped from general use, so that terms like aviatrix, benefactrix, legislatrix, oratrix, and proprietrix occur rarely or not at all in present-day English. The forms in -tor are applied to both men and women: Her sister is the proprietor of a new restaurant. When relevant, sex is specified with the generic term: Amelia Earhart was a pioneer woman aviator. Legal documents still use administratrix, executrix, inheritrix, and the like, but these forms too are giving way to the -tor forms. See also -enne, -ess, -ette.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for -trix

-trix

suffix
1.
indicating a feminine agent, corresponding to nouns ending in -tor: executrix
Word Origin
from Latin
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 -trix

fem. agential suffix, from Latin, corresponding to masc. -tor.

Online Etymology Dictionary, © 2010 Douglas Harper
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