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L, later I), formerly used to separate the figures representing decimals from those representing integers; now superseded by the decimal point.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).

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). < n.1660
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