Eicosaedrum

Full definition of eicosaedrum

Noun

1. Obsolete form of icosahedron
• 1662, Henry More, , Appendix, A Collection of Several Philosophical Writings of Dr. Henry More, p. 5189:"... That there are Five regular Bodies in Geometry, neither more nor less, viz., the Cube, the Tetraedrum, the Octaedrum, the Dodecaedrum and the Eicosaedrum ..."