"-erna" meaning in Latin

{
  "etymology_templates": [
    {
      "args": {
        "1": "la",
        "id": "container"
      },
      "expansion": "",
      "name": "etymid"
    }
  ],
  "etymology_text": "Related to -urnus, rnus.",
  "head_templates": [
    {
      "args": {
        "1": "-erna",
        "g": "f"
      },
      "expansion": "-erna f",
      "name": "la-suffix-noun"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "cavus (“hollow, empty”) + -erna → caverna (“cavern”)",
          "type": "example"
        }
      ],
      "glosses": [
        "a noun-forming suffix, used to denote a place or container"
      ],
      "id": "en--erna-la-suffix-HvsPByce",
      "tags": [
        "feminine",
        "morpheme"
      ]
    }
  ],
  "word": "-erna"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "la",
        "id": "container"
      },
      "expansion": "",
      "name": "etymid"
    }
  ],
  "etymology_text": "Related to -urnus, rnus.",
  "head_templates": [
    {
      "args": {
        "1": "-erna",
        "g": "f"
      },
      "expansion": "-erna f",
      "name": "la-suffix-noun"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Latin entries with incorrect language header",
        "Latin feminine suffixes",
        "Latin lemmas",
        "Latin noun-forming suffixes",
        "Latin suffixes",
        "Pages using catfix",
        "Pages with 3 entries",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "cavus (“hollow, empty”) + -erna → caverna (“cavern”)",
          "type": "example"
        }
      ],
      "glosses": [
        "a noun-forming suffix, used to denote a place or container"
      ],
      "tags": [
        "feminine",
        "morpheme"
      ]
    }
  ],
  "word": "-erna"
}