"tessara-" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "τέσσαρα",
        "4": "τέσσᾰρᾰ"
      },
      "expansion": "Ancient Greek τέσσᾰρᾰ (téssara)",
      "name": "uder"
    }
  ],
  "etymology_text": "From the Ancient Greek τέσσᾰρᾰ (téssara), the neuter plural and combining form of τέσσᾰρες (téssares, “four”); compare tetra-.",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prefix",
        "3": "prevocalic form",
        "4": "tessar-"
      },
      "expansion": "tessara- (prevocalic form tessar-)",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ancient Greek links with redundant target parameters",
          "parents": [
            "Links with redundant target parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English undefined derivations",
          "parents": [
            "Undefined derivations",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Four",
          "orig": "en:Four",
          "parents": [
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "tesseradecade"
        },
        {
          "word": "tessaradecasyllabon"
        },
        {
          "word": "tessaraglot"
        },
        {
          "word": "tessaraphthong"
        },
        {
          "word": "tesseratomic"
        }
      ],
      "glosses": [
        "four"
      ],
      "id": "en-tessara--en-prefix-BO-vCA9a",
      "links": [
        [
          "four",
          "four"
        ]
      ],
      "related": [
        {
          "word": "tessarakost"
        }
      ],
      "synonyms": [
        {
          "sense": "four",
          "tags": [
            "Latinate"
          ],
          "word": "quadr-"
        },
        {
          "sense": "four",
          "tags": [
            "Grecian"
          ],
          "word": "tetra-"
        },
        {
          "word": "tessera-"
        }
      ],
      "tags": [
        "morpheme"
      ],
      "wikipedia": [
        "number prefix"
      ]
    }
  ],
  "sounds": [
    {
      "enpr": "tĕʹsərə",
      "tags": [
        "Received-Pronunciation"
      ]
    },
    {
      "ipa": "/ˈtɛsəɹə/",
      "tags": [
        "Received-Pronunciation"
      ]
    }
  ],
  "word": "tessara-"
}

{
  "derived": [
    {
      "word": "tesseradecade"
    },
    {
      "word": "tessaradecasyllabon"
    },
    {
      "word": "tessaraglot"
    },
    {
      "word": "tessaraphthong"
    },
    {
      "word": "tesseratomic"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "τέσσαρα",
        "4": "τέσσᾰρᾰ"
      },
      "expansion": "Ancient Greek τέσσᾰρᾰ (téssara)",
      "name": "uder"
    }
  ],
  "etymology_text": "From the Ancient Greek τέσσᾰρᾰ (téssara), the neuter plural and combining form of τέσσᾰρες (téssares, “four”); compare tetra-.",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prefix",
        "3": "prevocalic form",
        "4": "tessar-"
      },
      "expansion": "tessara- (prevocalic form tessar-)",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "related": [
    {
      "word": "tessarakost"
    }
  ],
  "senses": [
    {
      "categories": [
        "Ancient Greek links with redundant target parameters",
        "English entries with incorrect language header",
        "English lemmas",
        "English prefixes",
        "English terms derived from Ancient Greek",
        "English undefined derivations",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Four"
      ],
      "glosses": [
        "four"
      ],
      "links": [
        [
          "four",
          "four"
        ]
      ],
      "tags": [
        "morpheme"
      ],
      "wikipedia": [
        "number prefix"
      ]
    }
  ],
  "sounds": [
    {
      "enpr": "tĕʹsərə",
      "tags": [
        "Received-Pronunciation"
      ]
    },
    {
      "ipa": "/ˈtɛsəɹə/",
      "tags": [
        "Received-Pronunciation"
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "four",
      "tags": [
        "Latinate"
      ],
      "word": "quadr-"
    },
    {
      "sense": "four",
      "tags": [
        "Grecian"
      ],
      "word": "tetra-"
    },
    {
      "word": "tessera-"
    }
  ],
  "word": "tessara-"
}

{
  "called_from": "form_descriptions/1698",
  "msg": "unrecognized head form: prevocalic form tessar-",
  "path": [
    "tessara-"
  ],
  "section": "English",
  "subsection": "prefix",
  "title": "tessara-",
  "trace": ""
}