"Етър" meaning in Bulgarian

{
  "etymology_templates": [
    {
      "args": {
        "1": "bg",
        "2": "Янтра"
      },
      "expansion": "Doublet of Янтра (Jantra)",
      "name": "doublet"
    }
  ],
  "etymology_text": "Doublet of Янтра (Jantra).",
  "forms": [
    {
      "form": "Etǎr",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Етър • (Etǎr)",
      "name": "bg-proper noun"
    }
  ],
  "lang": "Bulgarian",
  "lang_code": "bg",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Bulgarian entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "bg",
          "name": "Named buildings",
          "orig": "bg:Named buildings",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "bg",
          "name": "Places in Bulgaria",
          "orig": "bg:Places in Bulgaria",
          "parents": [
            "Places"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "a museum in Bulgaria"
      ],
      "id": "en-Етър-bg-name-xgB4849T",
      "links": [
        [
          "museum",
          "museum"
        ],
        [
          "Bulgaria",
          "Bulgaria#English"
        ]
      ]
    }
  ],
  "word": "Етър"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "bg",
        "2": "Янтра"
      },
      "expansion": "Doublet of Янтра (Jantra)",
      "name": "doublet"
    }
  ],
  "etymology_text": "Doublet of Янтра (Jantra).",
  "forms": [
    {
      "form": "Etǎr",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Етър • (Etǎr)",
      "name": "bg-proper noun"
    }
  ],
  "lang": "Bulgarian",
  "lang_code": "bg",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "Bulgarian doublets",
        "Bulgarian entries with incorrect language header",
        "Bulgarian lemmas",
        "Bulgarian proper nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "bg:Named buildings",
        "bg:Places in Bulgaria"
      ],
      "glosses": [
        "a museum in Bulgaria"
      ],
      "links": [
        [
          "museum",
          "museum"
        ],
        [
          "Bulgaria",
          "Bulgaria#English"
        ]
      ]
    }
  ],
  "word": "Етър"
}