English
icosasphere
From icosa- (“twenty”) + sphere.
A compound of icosa- ‘twenty’ + sphere
Proto-Indo-European *dwi- ‘two’
Proto-Indo-European *déḱm̥ ‘ten’
Proto-Indo-European *(h₁)wídḱm̥ti
Proto-Hellenic *ewī́kəti
Ancient Greek εἴκοσι ‘twenty’
English icosa-
Proto-Indo-European *sperH- ‘to kick, rebound, move convulsively’
…
Latin sphaera ‘ball, globe, celestial sphere’
Late Latin sphēra
Old French sphere ‘sphere (shape)’
Middle English spere ‘the cosmos, outer space’
English sphere
Today it means
noun A geometric figure with twenty or more triangular faces producing a semi-spherical solid.
Language periods are conventional ranges, not dates for this word.
Etymograph / icosasphere