octant

[ ok-tuhnt ]

/ ˈɒk tənt /

noun

the eighth part of a circle.

Mathematics. any of the eight parts into which three mutually perpendicular planes divide space.

an instrument having an arc of 24°, used by navigators for measuring angles up to 90°.

the position of one heavenly body when 45° distant from another.

(initial capital letter)Astronomy. the constellation Octans.

Origin of octant

1680–90; <Latin octant- (stem of octāns); see Octans

OTHER WORDS FROM octant

oc·tan·tal

[ok-tan-tl], /ɒkˈtæn tl/, adjective

Words nearby octant

octane number, octangle, octangular, octanoic acid, Octans, octant, octarchy, octaroon, octastyle, octateuch, octavalent

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for octant

A third staff (or an octant) was fixed at the end of the horizon-staff, and upon it the angle observed could be read off.
A Journal of the First Voyage of Vasco da Gama 1497-1499|Unknown
It was in its octant, and showed a crescent finely traced on the dark background of the sky.
From the Earth to the Moon, Direct in Ninety-Seven Hours and Twenty Minutes: and a Trip Round It|Jules Verne
Octant made of dark wood and with lignum vitae; brass fittings.
Early American Scientific Instruments and Their Makers|Silvio A. Bedini
Thus fig. 59 conveniently represents an octant of the wave surface, which cuts each coordinate plane in a circle and an ellipse.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6|Various

It is the sextant or some member of the sextant family - such as the quadrant, octant, etc.
Lectures in Navigation|Ernest Gallaudet Draper

British Dictionary definitions for octant

octant

/ (ˈɒktənt) /

noun

maths

any of the eight parts into which the three planes containing the Cartesian coordinate axes divide space
an eighth part of a circle

astronomy the position of a celestial body when it is at an angular distance of 45° from another body

an instrument used for measuring angles, similar to a sextant but having a graduated arc of 45°

Word Origin for octant

C17: from Latin octans half quadrant, from octo eight

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

单词	octant
释义	octant [ ok-tuhnt ] / ˈɒk tənt / noun the eighth part of a circle. Mathematics. any of the eight parts into which three mutually perpendicular planes divide space. an instrument having an arc of 24°, used by navigators for measuring angles up to 90°. the position of one heavenly body when 45° distant from another. (initial capital letter)Astronomy. the constellation Octans. Origin of octant 1680–90; <Latin octant- (stem of octāns); see Octans OTHER WORDS FROM octant oc·tan·tal [ok-tan-tl], /ɒkˈtæn tl/, adjective Words nearby octant octane number, octangle, octangular, octanoic acid, Octans, octant, octarchy, octaroon, octastyle, octateuch, octavalent Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for octant A third staff (or an octant) was fixed at the end of the horizon-staff, and upon it the angle observed could be read off. A Journal of the First Voyage of Vasco da Gama 1497-1499\|Unknown It was in its octant, and showed a crescent finely traced on the dark background of the sky. From the Earth to the Moon, Direct in Ninety-Seven Hours and Twenty Minutes: and a Trip Round It\|Jules Verne Octant made of dark wood and with lignum vitae; brass fittings. Early American Scientific Instruments and Their Makers\|Silvio A. Bedini Thus fig. 59 conveniently represents an octant of the wave surface, which cuts each coordinate plane in a circle and an ellipse. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6\|Various It is the sextant or some member of the sextant family - such as the quadrant, octant, etc. Lectures in Navigation\|Ernest Gallaudet Draper British Dictionary definitions for octant octant / (ˈɒktənt) / noun maths any of the eight parts into which the three planes containing the Cartesian coordinate axes divide space an eighth part of a circle astronomy the position of a celestial body when it is at an angular distance of 45° from another body an instrument used for measuring angles, similar to a sextant but having a graduated arc of 45° Word Origin for octant C17: from Latin octans half quadrant, from octo eight Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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