"tessara-" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "τέσσαρα",
        "4": "τέσσᾰρᾰ"
      },
      "expansion": "Ancient Greek τέσσᾰρᾰ (téssără)",
      "name": "uder"
    }
  ],
  "etymology_text": "From the Ancient Greek τέσσᾰρᾰ (téssără), the neuter plural and combining form of τέσσᾰρες (téssăres, “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 using catfix",
          "parents": [],
          "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": "tessaradecasyllabon"
        },
        {
          "word": "tessaraglot"
        },
        {
          "word": "tessaraphthong"
        },
        {
          "word": "tesseradecade"
        },
        {
          "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": "tessaradecasyllabon"
    },
    {
      "word": "tessaraglot"
    },
    {
      "word": "tessaraphthong"
    },
    {
      "word": "tesseradecade"
    },
    {
      "word": "tesseratomic"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "τέσσαρα",
        "4": "τέσσᾰρᾰ"
      },
      "expansion": "Ancient Greek τέσσᾰρᾰ (téssără)",
      "name": "uder"
    }
  ],
  "etymology_text": "From the Ancient Greek τέσσᾰρᾰ (téssără), the neuter plural and combining form of τέσσᾰρες (téssăres, “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 using catfix",
        "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": ""
}