First Known Use: 14th century
Dictionary
planisphere
noun pla·ni·sphere \ˈplā-nə-ˌsfir\
Definition of PLANISPHERE
: a representation of the circles of the sphere on a plane; especially : a polar projection of the celestial sphere and the stars on a plane with adjustable circles or other appendages for showing celestial phenomena for any given time
— pla·ni·spher·ic \ˌplā-nə-ˈsfir-ik, -ˈsfer-\ adjective
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Origin of PLANISPHERE
alteration of Middle English planisperie, from Medieval Latin planisphaerium, from Latin planum plane + sphaera sphere
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