"hairpin loop" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions nominales en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de hairpin et de loop."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en anglais",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Exemples en anglais à traduire",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Lexique en anglais de la génétique",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages liées à Wikipédia en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Stem-loop sur l’encyclopédie Wikipédia (en anglais)",
          "text": "The structure is also known as a hairpin or hairpin loop."
        }
      ],
      "glosses": [
        "Boucle en épingle à cheveux."
      ],
      "id": "fr-hairpin_loop-en-noun-uU9QJmpQ",
      "raw_tags": [
        "Génétique"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "stem-loop"
    }
  ],
  "word": "hairpin loop"
}

{
  "categories": [
    "Compositions en anglais",
    "Locutions nominales en anglais",
    "anglais"
  ],
  "etymology_texts": [
    "Composé de hairpin et de loop."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        "Exemples en anglais",
        "Exemples en anglais à traduire",
        "Lexique en anglais de la génétique",
        "Pages liées à Wikipédia en anglais"
      ],
      "examples": [
        {
          "ref": "Stem-loop sur l’encyclopédie Wikipédia (en anglais)",
          "text": "The structure is also known as a hairpin or hairpin loop."
        }
      ],
      "glosses": [
        "Boucle en épingle à cheveux."
      ],
      "raw_tags": [
        "Génétique"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "stem-loop"
    }
  ],
  "word": "hairpin loop"
}