A punctuation mark (/) used to separate related items of information

Wikipedia Word definitions in Wikipedia
In mathematics , a separatrix is the boundary separating two modes of behaviour in a differential equation .

Wiktionary Word definitions in Wiktionary
n. 1 (context mathematics English) The boundary separating two modes of behaviour in a differential equation. 2 (context mathematics archaic English) The decimal point.

WordNet Word definitions in WordNet
n. a punctuation mark (/) used to separate related items of information [syn: solidus , slash , virgule , diagonal , stroke ] [also: separatrices (pl)]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Separatrix \Sep`a*ra"trix\, n.; pl. L. -trices , E. -trixes . [L., she that separates.] (Arith.) 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 ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
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.)).