quintantn.

Brit.

/ˈkwɪntənt/, U.S.

/ˈkwɪntnt/

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin quīntus , -ant suffix¹.

Etymology: < classical Latin quīntus fifth (see quint n.¹) + -ant suffix¹, after quadrant n.¹ and sextant n. With sense 2 compare also earlier octant n.

†1. Mathematics. One-fifth of the circumference of a circle. Obsolete. rare.

ΘΚΠ

the world > relative properties > number > geometry > curve > [noun] > part of circle

arc1570

sextans1596

circumference1656

quadrant1660

quintant1684

sextant1730

octant1753

supplemental arc1754

multiple arc1802

explement1817

1684 J. Wallis Treat. Angular Sections iv. 31 The same Chord subtends on the one side to one Quintant, and on the other side to four such.

2. An instrument formerly used for making angular measurements, esp. in astronomy and navigation, analogous to a sextant but having a notional arc of 72 degrees rather than 60 degrees, and so measuring up to 72 degrees (or 144 if the instrument has a mirror). Cf. octant n. 1a, quadrant n.¹ 7.In practice makers often made quintants with a scale greater than 72 degrees.

ΚΠ

c1781 Explan. Princ. & Use New Constructed Quadrant 14 The Quintant is adjusted in the same manner,..but having an Arch graduated to 155 degrees, will require no second removal or adjustment in the Index.

1818 Trans. Amer. Philos. Soc. 1 331 By means of this inclined plane, the common octant may have its range extended to that of the sextant, or even to that of the quintant.

1861 Proc. Royal Geogr. Soc. 5 41 List of Instruments, Books, &c., supplied to Consul Petherick by the Society. Quintant, by Cary; Sextant, by Casella; Telescope [etc.].

1973 Burlington Mag. Oct. p. xxxvi (advt.) A brass lightweight quintant by Cary.

1997 Isis 88 327/2 The instrument..is not a quintant but somewhere between an octant and a sextant.

This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).

单词	quintant
释义	quintantn. Brit. /ˈkwɪntənt/, U.S. /ˈkwɪntnt/ Origin: A borrowing from Latin, combined with an English element. Etymons: Latin quīntus , -ant suffix¹. Etymology: < classical Latin quīntus fifth (see quint n.¹) + -ant suffix¹, after quadrant n.¹ and sextant n. With sense 2 compare also earlier octant n. †1. Mathematics. One-fifth of the circumference of a circle. Obsolete. rare. ΘΚΠ the world > relative properties > number > geometry > curve > [noun] > part of circle arc1570 sextans1596 circumference1656 quadrant1660 quintant1684 sextant1730 octant1753 supplemental arc1754 multiple arc1802 explement1817 1684 J. Wallis Treat. Angular Sections iv. 31 The same Chord subtends on the one side to one Quintant, and on the other side to four such. 2. An instrument formerly used for making angular measurements, esp. in astronomy and navigation, analogous to a sextant but having a notional arc of 72 degrees rather than 60 degrees, and so measuring up to 72 degrees (or 144 if the instrument has a mirror). Cf. octant n. 1a, quadrant n.¹ 7.In practice makers often made quintants with a scale greater than 72 degrees. ΚΠ c1781 Explan. Princ. & Use New Constructed Quadrant 14 The Quintant is adjusted in the same manner,..but having an Arch graduated to 155 degrees, will require no second removal or adjustment in the Index. 1818 Trans. Amer. Philos. Soc. 1 331 By means of this inclined plane, the common octant may have its range extended to that of the sextant, or even to that of the quintant. 1861 Proc. Royal Geogr. Soc. 5 41 List of Instruments, Books, &c., supplied to Consul Petherick by the Society. Quintant, by Cary; Sextant, by Casella; Telescope [etc.]. 1973 Burlington Mag. Oct. p. xxxvi (advt.) A brass lightweight quintant by Cary. 1997 Isis 88 327/2 The instrument..is not a quintant but somewhere between an octant and a sextant. This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022). < n.1684
随便看	head of horns head of house head of land head of state head of steam head of the class head of the corner head of the river head of the school head of water head off head off at the pass head office head office accounts head or tail head over head over ears head over heels head over tip head page head pan head penny head pensionary head prefect head pulls