"Arenig" meaning in English

{
  "etymology_text": "The term was first used by Adam Sedgwick in 1847 with reference to the \"Arenig Ashes and Porphyries\" in the neighbourhood of Arenig Fawr, in Merioneth, North Wales.",
  "head_templates": [
    {
      "args": {},
      "expansion": "Arenig",
      "name": "en-prop"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A time interval during the Lower Ordovician period."
      ],
      "id": "en-Arenig-en-name-IJ929cc1",
      "links": [
        [
          "geology",
          "geology"
        ]
      ],
      "raw_glosses": [
        "(geology) A time interval during the Lower Ordovician period."
      ],
      "synonyms": [
        {
          "word": "Arenigian"
        }
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    }
  ],
  "word": "Arenig"
}

{
  "etymology_text": "The term was first used by Adam Sedgwick in 1847 with reference to the \"Arenig Ashes and Porphyries\" in the neighbourhood of Arenig Fawr, in Merioneth, North Wales.",
  "head_templates": [
    {
      "args": {},
      "expansion": "Arenig",
      "name": "en-prop"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English proper nouns",
        "English uncountable nouns",
        "en:Geology"
      ],
      "glosses": [
        "A time interval during the Lower Ordovician period."
      ],
      "links": [
        [
          "geology",
          "geology"
        ]
      ],
      "raw_glosses": [
        "(geology) A time interval during the Lower Ordovician period."
      ],
      "synonyms": [
        {
          "word": "Arenigian"
        }
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    }
  ],
  "word": "Arenig"
}