"maître-cylindre" meaning in French

{
  "forms": [
    {
      "form": "maîtres-cylindres",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "maîtres-cylindres"
      },
      "expansion": "maître-cylindre m (plural maîtres-cylindres)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Engineering",
          "orig": "fr:Engineering",
          "parents": [
            "Applied sciences",
            "Technology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "master cylinder"
      ],
      "id": "en-maître-cylindre-fr-noun-~KyQSouk",
      "links": [
        [
          "engineering",
          "engineering#Noun"
        ],
        [
          "master cylinder",
          "master cylinder"
        ]
      ],
      "raw_glosses": [
        "(engineering) master cylinder"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "fr:maître-cylindre"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/mɛ.tʁə.si.lɛ̃dʁ/"
    },
    {
      "ipa": "/me.tʁə.si.lɛ̃dʁ/"
    }
  ],
  "word": "maître-cylindre"
}

{
  "forms": [
    {
      "form": "maîtres-cylindres",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "maîtres-cylindres"
      },
      "expansion": "maître-cylindre m (plural maîtres-cylindres)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French 4-syllable words",
        "French countable nouns",
        "French entries with incorrect language header",
        "French lemmas",
        "French masculine nouns",
        "French multiword terms",
        "French nouns",
        "French terms with IPA pronunciation",
        "fr:Engineering"
      ],
      "glosses": [
        "master cylinder"
      ],
      "links": [
        [
          "engineering",
          "engineering#Noun"
        ],
        [
          "master cylinder",
          "master cylinder"
        ]
      ],
      "raw_glosses": [
        "(engineering) master cylinder"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "fr:maître-cylindre"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/mɛ.tʁə.si.lɛ̃dʁ/"
    },
    {
      "ipa": "/me.tʁə.si.lɛ̃dʁ/"
    }
  ],
  "word": "maître-cylindre"
}