Separatrix
Pronunciation : Sep`a*ra"trix, n.; pl. L. -trices
Part of Speech : E.
Etymology : [L., she that separates.] (Arith.)
Definition : Defn: The decimal point; the dot placed at the left of a decimal fraction, to separate it from the whole number which it follows. The term is sometimes also applied to other marks of separation.
-trixes.
Source : Webster's Unabridged Dictionary, 1913