latusn.¹

/ˈleɪtəs/

Etymology: Latin = side.

Mathematics.

Used in the following terms in Conic sections: latus rectum n. a straight line drawn through the focus of a conic at right angles to the transverse diameter, the parameter. latus primarium n. (see quot. 1706¹).† latus transversum n. Obsolete the transverse diameter.

ΚΠ

1702 J. Raphson Math. Dict. App. Conic Sections 11 In a Parabola the Rectangle of the Diameter, and Latus Rectum, is equal to the Rectangle of the Segments of the double Ordinate.

1706 Phillips's New World of Words (new ed.) Latus primarium,..a Right-line drawn thro' the Vertex, or Top of the Section, parallel to the Base of the Triangular Section of the Cone, and within it.

1706 Phillips's New World of Words (new ed.) Latus Transversum, (in an Hyperbola) is a Right-line lying between the Vertex's of the two opposite Sections.

1734 J. Ward Introd. Math. (ed. 6) iv. i. 367 The Diameter of a Circle being that Right-line which passes thro' its Centre or Focus..may..be properly call'd the Circle's Latus Rectum: And altho' it loses the Name of Diameter when the Circle degenerates into an Ellipsis, yet it retains the Name of Latus Rectum.

1859 S. Parkinson Treat. Optics ii. vi. 245 A luminous point is placed at one of the foci of a semi-elliptic arc bounded by the axis major: prove that the whole illumination of the arc varies inversely as the latus rectum.

This entry has not yet been fully updated (first published 1902; most recently modified version published online September 2018).

latusn.²

/ˈleɪtəs/

Etymology: Late Latin = Greek λάτος.

Historical.

A large fish inhabiting the Nile and other regions.

ΘΚΠ

the world > animals > fish > superorder Acanthopterygii (spiny fins) > order Perciformes (perches) > family Serranidae (sea-bass) > [noun] > member of genus Lates (Nile perch)

latus1598

cockup1718

lates1835

barramundi1873

Nile perch1931

1598 tr. G. de Rosselli Epulario F iiij b To dresse a Latus or shadow fish.

1706 Phillips's New World of Words (new ed.) Latus,..a huge Fish peculiar to the River Nile, which is often of Two Hundred Pounds Weight.

1753 Chambers's Cycl. Suppl. Latus,..the name of a fish of the coracinus, or umbra kind.

1857 S. Birch Hist. Anc. Pottery (1858) I. 90 Among fishes, the latus,..and the oxyrhyncus.

This entry has not yet been fully updated (first published 1902; most recently modified version published online September 2018).

单词	latus
释义	latusn.¹ /ˈleɪtəs/ Etymology: Latin = side. Mathematics. Used in the following terms in Conic sections: latus rectum n. a straight line drawn through the focus of a conic at right angles to the transverse diameter, the parameter. latus primarium n. (see quot. 1706¹).† latus transversum n. Obsolete the transverse diameter. ΚΠ 1702 J. Raphson Math. Dict. App. Conic Sections 11 In a Parabola the Rectangle of the Diameter, and Latus Rectum, is equal to the Rectangle of the Segments of the double Ordinate. 1706 Phillips's New World of Words (new ed.) Latus primarium,..a Right-line drawn thro' the Vertex, or Top of the Section, parallel to the Base of the Triangular Section of the Cone, and within it. 1706 Phillips's New World of Words (new ed.) Latus Transversum, (in an Hyperbola) is a Right-line lying between the Vertex's of the two opposite Sections. 1734 J. Ward Introd. Math. (ed. 6) iv. i. 367 The Diameter of a Circle being that Right-line which passes thro' its Centre or Focus..may..be properly call'd the Circle's Latus Rectum: And altho' it loses the Name of Diameter when the Circle degenerates into an Ellipsis, yet it retains the Name of Latus Rectum. 1859 S. Parkinson Treat. Optics ii. vi. 245 A luminous point is placed at one of the foci of a semi-elliptic arc bounded by the axis major: prove that the whole illumination of the arc varies inversely as the latus rectum. This entry has not yet been fully updated (first published 1902; most recently modified version published online September 2018). latusn.² /ˈleɪtəs/ Etymology: Late Latin = Greek λάτος. Historical. A large fish inhabiting the Nile and other regions. ΘΚΠ the world > animals > fish > superorder Acanthopterygii (spiny fins) > order Perciformes (perches) > family Serranidae (sea-bass) > [noun] > member of genus Lates (Nile perch) latus1598 cockup1718 lates1835 barramundi1873 Nile perch1931 1598 tr. G. de Rosselli Epulario F iiij b To dresse a Latus or shadow fish. 1706 Phillips's New World of Words (new ed.) Latus,..a huge Fish peculiar to the River Nile, which is often of Two Hundred Pounds Weight. 1753 Chambers's Cycl. Suppl. Latus,..the name of a fish of the coracinus, or umbra kind. 1857 S. Birch Hist. Anc. Pottery (1858) I. 90 Among fishes, the latus,..and the oxyrhyncus. This entry has not yet been fully updated (first published 1902; most recently modified version published online September 2018). < n.¹1702n.²1598
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