"tetraedrum" meaning in English

{
  "forms": [
    {
      "form": "tetraedra",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "tetraedra"
      },
      "expansion": "tetraedrum (plural tetraedra)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "tetrahedron"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1662, Henry More, An Antidote Against Atheism, Book II, A Collection of Several Philosophical Writings of Dr. Henry More, p. 54",
          "text": "[…] 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 […]"
        }
      ],
      "glosses": [
        "Obsolete form of tetrahedron."
      ],
      "id": "en-tetraedrum-en-noun-lzxSL36o",
      "links": [
        [
          "tetrahedron",
          "tetrahedron#English"
        ]
      ],
      "tags": [
        "alt-of",
        "obsolete"
      ]
    }
  ],
  "word": "tetraedrum"
}

{
  "forms": [
    {
      "form": "tetraedra",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "tetraedra"
      },
      "expansion": "tetraedrum (plural tetraedra)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "tetrahedron"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with irregular plurals",
        "English obsolete forms"
      ],
      "examples": [
        {
          "ref": "1662, Henry More, An Antidote Against Atheism, Book II, A Collection of Several Philosophical Writings of Dr. Henry More, p. 54",
          "text": "[…] 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 […]"
        }
      ],
      "glosses": [
        "Obsolete form of tetrahedron."
      ],
      "links": [
        [
          "tetrahedron",
          "tetrahedron#English"
        ]
      ],
      "tags": [
        "alt-of",
        "obsolete"
      ]
    }
  ],
  "word": "tetraedrum"
}