"-er-" meaning in French

{
  "etymology_text": "Added before various suffixes (especially -ole and -on, but also sometimes -elle, -et, -ette, -eau, by analogy to or mistaken division of other words which end in erole, eron, ereau, etc, where the er was part of the first element (e.g. fougerolle, fougerole, from fougère + -ole) or the entire word was borrowed from another language such as Italian (e.g. muserole, muserolle, from Italian museruola).",
  "head_templates": [
    {
      "args": {
        "1": "fr",
        "2": "interfix"
      },
      "expansion": "-er-",
      "name": "head"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "interfix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "French interfixes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 7 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "_dis": "16 15 15 13 15 1 5 2 5 1 5 2 5",
          "kind": "other",
          "name": "Pages with 7 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "15 14 14 12 14 1 6 1 6 1 6 1 6",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "-erelle (coquerelle), -eret (coqueret), -erette (collerette), -ereau (poétereau), -erole (èverole), -eron (laideron)"
        }
      ],
      "glosses": [
        "used before various noun-forming suffixes"
      ],
      "id": "en--er--fr-interfix-M-GtnJgB",
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-er-"
}

{
  "categories": [
    "Pages with 7 entries",
    "Pages with entries"
  ],
  "etymology_text": "Added before various suffixes (especially -ole and -on, but also sometimes -elle, -et, -ette, -eau, by analogy to or mistaken division of other words which end in erole, eron, ereau, etc, where the er was part of the first element (e.g. fougerolle, fougerole, from fougère + -ole) or the entire word was borrowed from another language such as Italian (e.g. muserole, muserolle, from Italian museruola).",
  "head_templates": [
    {
      "args": {
        "1": "fr",
        "2": "interfix"
      },
      "expansion": "-er-",
      "name": "head"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "interfix",
  "senses": [
    {
      "categories": [
        "French entries with incorrect language header",
        "French interfixes",
        "French lemmas",
        "Pages with 7 entries",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "-erelle (coquerelle), -eret (coqueret), -erette (collerette), -ereau (poétereau), -erole (èverole), -eron (laideron)"
        }
      ],
      "glosses": [
        "used before various noun-forming suffixes"
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-er-"
}