"microhertz" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Dérivations en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Lemmes en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en anglais préfixés avec micro-",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Unités de mesure en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Dérivé de hertz, avec le préfixe micro-."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Termes rares en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Microhertz (μHz)."
      ],
      "id": "fr-microhertz-en-noun-8hsWxmB~",
      "tags": [
        "rare"
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "tags": [
    "plural",
    "singular"
  ],
  "word": "microhertz"
}

{
  "categories": [
    "Dérivations en anglais",
    "Lemmes en anglais",
    "Mots en anglais préfixés avec micro-",
    "Noms communs en anglais",
    "Unités de mesure en anglais",
    "anglais"
  ],
  "etymology_texts": [
    "Dérivé de hertz, avec le préfixe micro-."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Termes rares en anglais"
      ],
      "glosses": [
        "Microhertz (μHz)."
      ],
      "tags": [
        "rare"
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "tags": [
    "plural",
    "singular"
  ],
  "word": "microhertz"
}