"Mallen streak" meaning in English

{
  "etymology_text": "Coined by Catherine Cookson in her Mallen trilogy, a series of books about a family named Mallen who all shared this trait.",
  "forms": [
    {
      "form": "Mallen streaks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Mallen streak (plural Mallen streaks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "a streak of white, red, grey or black hair which grows amidst normally colored hair"
      ],
      "id": "en-Mallen_streak-en-noun-OcFDZtlP",
      "links": [
        [
          "streak",
          "streak"
        ]
      ],
      "related": [
        {
          "word": "poliosis"
        }
      ]
    }
  ],
  "word": "Mallen streak"
}

{
  "etymology_text": "Coined by Catherine Cookson in her Mallen trilogy, a series of books about a family named Mallen who all shared this trait.",
  "forms": [
    {
      "form": "Mallen streaks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Mallen streak (plural Mallen streaks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "poliosis"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys"
      ],
      "glosses": [
        "a streak of white, red, grey or black hair which grows amidst normally colored hair"
      ],
      "links": [
        [
          "streak",
          "streak"
        ]
      ]
    }
  ],
  "word": "Mallen streak"
}