Icosaedrum

Full definition of icosaedrum

Noun

1. Obsolete form of icosahedron
• 1662, Henry More, , Book II, A Collection of Several Philosophical Writings of Dr. Henry More, p. 54:"... for example, a rightly-cut Tetraedrum, Cube or Icosaedrum have no more pulchritude in them, then any rude broken stone lying in the field or high-ways ..."