What do a.m. and p.m. stand for?


[plan-uh-sfeer, pley-nuh-] /ˈplæn əˌsfɪər, ˈpleɪ nə-/
a map of half or more of the celestial sphere with a device for indicating the part of a given location visible at a given time.
a projection or representation of the whole or a part of a sphere on a plane.
Origin of planisphere
1350-1400; plani- + sphere; replacing Middle English planisperie < Medieval Latin plānisphaerium
Related forms
[plan-uh-sfer-i-kuh l, -sfeer-, pley-nuh-] /ˌplæn əˈsfɛr ɪ kəl, -ˈsfɪər-, ˌpleɪ nə-/ (Show IPA),
planispheric, planispheral
[plan-i-sfeer-uh l, pley-nuh-] /ˌplæn ɪˈsfɪər əl, ˌpleɪ nə-/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for planisphere
  • It is a planisphere or world map summarizing the extent of geographical knowledge at the beginning of the seventeenth century.
  • Bring your planisphere or telescope if you have one.
British Dictionary definitions for planisphere


a projection or representation of all or part of a sphere on a plane surface, such as a polar projection of the celestial sphere onto a chart
Derived Forms
planispheric (ˌplænɪˈsfɛrɪk) adjective
Word Origin
C14: from Medieval Latin plānisphaerium, from Latin plānus flat + Greek sphaira globe
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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Word Origin and History for planisphere

late 14c., from Medieval Latin planisphaerium, from Latin planus (see plane (n.1)) + sphaera (see sphere (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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