"auxiliary oiler" meaning in English

{
  "forms": [
    {
      "form": "auxiliary oilers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "auxiliary oiler (plural auxiliary oilers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A naval oil tanker with the ability to perform underway replenishment of fuel oil or ship oil to ships of the fleet."
      ],
      "id": "en-auxiliary_oiler-en-noun-A1N4MFSl",
      "links": [
        [
          "fuel oil",
          "fuel oil"
        ],
        [
          "ship oil",
          "ship oil"
        ]
      ],
      "raw_glosses": [
        "(US, Navy) A naval oil tanker with the ability to perform underway replenishment of fuel oil or ship oil to ships of the fleet."
      ],
      "synonyms": [
        {
          "sense": "naval oil tanker",
          "word": "AO"
        }
      ],
      "tags": [
        "Navy",
        "US"
      ]
    }
  ],
  "word": "auxiliary oiler"
}

{
  "forms": [
    {
      "form": "auxiliary oilers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "auxiliary oiler (plural auxiliary oilers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "A naval oil tanker with the ability to perform underway replenishment of fuel oil or ship oil to ships of the fleet."
      ],
      "links": [
        [
          "fuel oil",
          "fuel oil"
        ],
        [
          "ship oil",
          "ship oil"
        ]
      ],
      "raw_glosses": [
        "(US, Navy) A naval oil tanker with the ability to perform underway replenishment of fuel oil or ship oil to ships of the fleet."
      ],
      "tags": [
        "Navy",
        "US"
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "naval oil tanker",
      "word": "AO"
    }
  ],
  "word": "auxiliary oiler"
}