tetraedrum

tetraedrum (plural tetraedra)

1. Obsolete form of tetrahedron.
   • 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 ..."

From Ancient Greek τετράεδρον (tetráedron, “four-sided”), from τέτταρες (téttares, “four”) + ἕδρα (hédra, “seat, base, face”).

• (Classical Latin) IPA^(key): [tɛˈtra.ɛ.drũː]
• (modern Italianate Ecclesiastical) IPA^(key): [teˈtraː.e.drum]

tetraëdrum n (genitive tetraëdrī); second declension

1. (geometry) A tetrahedron; a solid figure with four faces.

Second-declension noun (neuter).

• → English: tetrahedron
• → French: tétraèdre