"hemiarch" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "hemi",
        "3": "arch"
      },
      "expansion": "hemi- + arch",
      "name": "prefix"
    }
  ],
  "etymology_text": "hemi- + arch",
  "forms": [
    {
      "form": "hemiarches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hemiarch (plural hemiarches)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with hemi-",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2015 October 22, “Evaluation in a Dog Model of Three Antimicrobial Glassy Coatings: Prevention of Bone Loss around Implants and Microbial Assessments”, in PLOS ONE, →DOI",
          "text": "Four dental implants were inserted on each hemiarch.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Either half of an arch"
      ],
      "id": "en-hemiarch-en-noun-WBr4gcNw",
      "links": [
        [
          "half",
          "half"
        ],
        [
          "arch",
          "arch"
        ]
      ]
    }
  ],
  "word": "hemiarch"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "hemi",
        "3": "arch"
      },
      "expansion": "hemi- + arch",
      "name": "prefix"
    }
  ],
  "etymology_text": "hemi- + arch",
  "forms": [
    {
      "form": "hemiarches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hemiarch (plural hemiarches)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with hemi-",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2015 October 22, “Evaluation in a Dog Model of Three Antimicrobial Glassy Coatings: Prevention of Bone Loss around Implants and Microbial Assessments”, in PLOS ONE, →DOI",
          "text": "Four dental implants were inserted on each hemiarch.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Either half of an arch"
      ],
      "links": [
        [
          "half",
          "half"
        ],
        [
          "arch",
          "arch"
        ]
      ]
    }
  ],
  "word": "hemiarch"
}