[plan-uh-sfeer, pley-nuh-]
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.

1350–1400; plani- + sphere; replacing Middle English planisperie < Medieval Latin plānisphaerium

planispherical [plan-uh-sfer-i-kuhl, -sfeer-, pley-nuh-] , planispheric, planispheral [plan-i-sfeer-uhl, pley-nuh-] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
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
[C14: from Medieval Latin plānisphaerium, from Latin plānus flat + Greek sphaira globe]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
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.
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