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separatrix

[sep-uh-rey-triks, sep-uh-rey-] /ˈsɛp əˌreɪ trɪks, ˌsɛp əˈreɪ-/
noun, plural separatrices
[sep-uh-rey-tri-seez, -er-uh-trahy-seez] /ˌsɛp əˈreɪ trɪˌsiz, -ər əˈtraɪ siz/ (Show IPA),
separatrixes.
1.
something that divides or separates, as the line between light and dark areas on a partially illuminated surface.
2.
3.
Mathematics. one of several symbols for separating components of a number, as a decimal point or comma.
Origin
1650-1660
1650-60; < Neo-Latin sēparātrīx, Late Latin; see separator, -trix
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for separatrices

separatrix

/ˈsɛpəˌreɪtrɪks/
noun (pl) separatrices (ˌsɛpəˈreɪtrɪˌsiːz)
1.
another name for solidus (sense 1)
Word Origin
via New Latin from Late Latin, feminine of sēparātor one that separates
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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