Rarest

//ˈɹɛɹəst// adj

Definitions

Adjective
  1. 1
    superlative form of rare: most rare form-of, superlative

    "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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