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单词 polaris
释义

Polaris

[ poh-lair-is, -lar-, puh- ]
/ poʊˈlɛər ɪs, -ˈlær-, pə- /

noun

Astronomy. the polestar or North Star, a star of the second magnitude situated close to the north pole of the heavens, in the constellation Ursa Minor: the outermost star in the handle of the Little Dipper.
a two-stage U.S. ballistic missile, usually fired from a submerged submarine.

Origin of Polaris

1955–60; short for Medieval Latin stella polāris polar star

Words nearby Polaris

polar distance, polar equation, polar front, Polari, polarimeter, Polaris, polariscope, polarity, polarization, polarization charge, polarize
Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for Polaris

British Dictionary definitions for Polaris

Polaris
/ (pəˈlɑːrɪs) /

noun

Also called: the Pole Star, the North Star the brightest star in the constellation Ursa Minor, situated slightly less than 1° from the north celestial pole. It is a Cepheid variable, with a period of four days. Visual magnitude: 2.08–2.17; spectral type: F8Ib
  1. a type of US two-stage intermediate-range ballistic missile, usually fired by a submerged submarine
  2. (as modifier)a Polaris submarine

Word Origin for Polaris

shortened from Medieval Latin stella polāris polar star
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

Scientific definitions for Polaris

Polaris
[ pə-lărĭs ]

A bright star at the end of the handle of the Little Dipper in the constellation Ursa Minor. Polaris is 1° from the north celestial pole, and it remains in the same location in the sky all year, making it a useful navigation tool. Polaris is actually a double star with a faint companion star and has an apparent magnitude of 2.04. Also called North Star. Scientific name: Alpha Ursae Minoris.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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更新时间:2025/1/11 13:18:20