icosaedrum

== English == === Noun === icosaedrum (plural icosaedra) Obsolete form of icosahedron. 1662, Henry More, An Antidote Against Atheism, 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 ..."