[ 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·i·spher·i·cal [plan-uh-sfer-i-kuh l, -sfeer-, pley-nuh-] /ˌplæn əˈsfɛr ɪ kəl, -ˈsfɪər-, ˌpleɪ nə-/, plan·i·spher·ic, plan·i·spher·al [plan-i-sfeer-uh l, pley-nuh-] /ˌplæn ɪˈsfɪər əl, ˌpleɪ nə-/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for planisphere

British Dictionary definitions for planisphere


/ (ˈplænɪˌsfɪə) /


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 for planisphere

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