n.
Pronunciation: ' pl ā -n ə - ˌ sfir
Function: noun
Etymology: alteration of Middle English planisperie, from Medieval Latin planisphaerium, from Latin planum plane + sphaera sphere
Date: 1571
: 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 \ ˌ pl ā -n ə - ' sfir-ik, - ' sfer- \ adjective