separatrix

[sep-uh-rey-triks, sep-uh-rey-]
noun, plural separatrices [sep-uh-rey-tri-seez, -er-uh-trahy-seez] , separatrixes.
1.
something that divides or separates, as the line between light and dark areas on a partially illuminated surface.
3.
Mathematics. one of several symbols for separating components of a number, as a decimal point or comma.

Origin:
1650–60; < Neo-Latin sēparātrīx, Late Latin; see separator, -trix

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World English Dictionary
separatrix (ˈsɛpəˌreɪtrɪks)
 
n , pl separatrices
another name for solidus
 
[via New Latin from Late Latin, feminine of sēparātor one that separates]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Faraday rotation techniques are being developed to measure the magnetic field profiles inside the separatrix.
Plasma shape and position, separatrix- wall gaps, gap between separatrixes.
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