"cf." meaning in Welsh

{
  "head_templates": [
    {
      "args": {},
      "expansion": "cf.",
      "name": "cy-verb form"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 4 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Welsh entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "cf.; abbreviation of cymharer (“impersonal imperative of cymharu (“to compare”)”)."
      ],
      "id": "en-cf.-cy-verb-XHyzfNed",
      "links": [
        [
          "cf.",
          "cf.#English"
        ],
        [
          "cymharer",
          "cymharer#Welsh"
        ],
        [
          "cymharu",
          "cymharu#Welsh"
        ]
      ]
    }
  ],
  "word": "cf."
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "cf.",
      "name": "cy-verb form"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Pages with 4 entries",
        "Pages with entries",
        "Welsh abbreviations",
        "Welsh entries with incorrect language header",
        "Welsh non-lemma forms",
        "Welsh terms spelled with .",
        "Welsh verb forms"
      ],
      "glosses": [
        "cf.; abbreviation of cymharer (“impersonal imperative of cymharu (“to compare”)”)."
      ],
      "links": [
        [
          "cf.",
          "cf.#English"
        ],
        [
          "cymharer",
          "cymharer#Welsh"
        ],
        [
          "cymharu",
          "cymharu#Welsh"
        ]
      ]
    }
  ],
  "word": "cf."
}