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单词 separatrix
释义

separatrixn.

/sɛpəˈreɪtrɪks/
Forms: Plural separatrices /sɛpəˈreɪtrɪsiːz/.
Etymology: late Latin, feminine agent-noun < sēparāre to separate v.The feminine is in apposition to līnea line, understood.
1.
a. The mark (originally L, later I), formerly used to separate the figures representing decimals from those representing integers; now superseded by the decimal point. Obsolete.
ΘΚΠ
the world > relative properties > number > ratio or proportion > fraction > [noun] > decimal > point or place
fourth1594
prime1608
separatrix1660
third1660
decimal point1701
station1702
point1704
1660 J. Moore Arithm. 11 But the best and most distinct way of distinguishing them [sc. Decimals] is by a rectangular line after the place of the unit, called Seperatrix.
1660 J. Moore Arithm. 13 Therefore in writing of decimall parts let the seperatrix be always used.
b. (See quot. 1770.) Obsolete.
ΘΚΠ
the world > relative properties > number > ratio or proportion > fraction > [noun] > expressed by numerator and denominator > elements of
numerator1539
denominator1552
nominatora1690
separatrix1770
1770 P. Luckombe Conc. Hist. Printing 286 The Separatrix, or rule between the Numerator and Denominator [of fractions].
2. Proof-correction. (See quot. 1892.)
ΘΚΠ
society > communication > printing > correction > [noun] > of proofs > marks used in
caret1710
stet1755
rom.1824
l.c.1833
separatrix1892
1892 A. Oldfield Pract. Man. Typogr. iii. 34 A wrong letter is noted by a stroke being drawn through and the proper letter written on the margin with a stroke after it. This stroke is placed after all corrections to keep the various marks separate. It is sometimes called the separatrix.
3. The line separating light and shade on a partly illuminated surface. Cf. terminator n. 2.
ΚΠ
a1912 In recent Dicts.
4. Physics. A boundary between regions having differing configurations of magnetic lines of force.
ΚΠ
1956 Proc. CERN Symp. High Energy Accelerators I. 50/1 We see in fig. 3 the region of stability or ‘bucket’ within which particles execute stable phase oscillations... The bucket boundary, or separatrix is given by eq. (43).
1956 Proc. CERN Symp. High Energy Accelerators I. 54/2 The region between the two separatrices.
1979 Sci. Amer. Aug. 44 (caption) The tokamak..is equipped with a magnetic divertor, an arrangement in which a magnetic-field separatrix is employed to prevent impurity ions from entering the main plasma column.
This entry has not yet been fully updated (first published 1912; most recently modified version published online December 2018).
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n.1660
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