"rarest" meaning in English

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  "lang_code": "en",
  "pos": "adj",
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          "ref": "2024 March 20, Chris Howe, “High speed underneath the Chilterns...”, in RAIL, number 1005, page 33:",
          "text": "Yet despite sounding inhospitable, grasslands such as this are home to a huge variety of smaller herbs and wildflowers, including some of the UK's rarest orchids and invertebrates, in addition to being home to butterfly species such as the Chalkhill Blue.",
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      "form_of": [
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          "extra": "most rare",
          "word": "rare"
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        "superlative form of rare: most rare"
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  "word": "rarest"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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        {
          "ref": "2024 March 20, Chris Howe, “High speed underneath the Chilterns...”, in RAIL, number 1005, page 33:",
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          "extra": "most rare",
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  "word": "rarest"
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