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separatrix

[sep-uh-rey-triks, sep-uh-rey-]
noun, plural sep·a·ra·tri·ces [sep-uh-rey-tri-seez, -er-uh-trahy-seez] /ˌsɛp əˈreɪ trɪˌsiz, -ər əˈtraɪ siz/, sep·a·ra·trix·es.
  1. something that divides or separates, as the line between light and dark areas on a partially illuminated surface.
  2. virgule.
  3. Mathematics. one of several symbols for separating components of a number, as a decimal point or comma.
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Origin of separatrix

1650–60; < New Latin sēparātrīx, Late Latin; see separator, -trix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for separatrix

separatrix

noun plural separatrices (ˌsɛpəˈreɪtrɪˌsiːz)
  1. another name for solidus (def. 1)
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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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for separatrix

n.

line or hooked line used to separate printed figures, originally with numerals and used where modern texts use a decimal point, also in other specialized senses, from Late Latin (linea) separatrix, feminine agent noun from separare (see separate (v.)).

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Online Etymology Dictionary, © 2010 Douglas Harper