rarest

[rare.s.01] as in: not widely known; especially valued for its uncommonness

[rare.s.02] as in: recurring only at long intervals

[rare.s.03] as in: not widely distributed

[rare.s.04] as in: having low density

[rare.s.05] as in: marked by an uncommon quality; especially superlative or extreme of its kind; -J.R.Lowell

[rare.s.06] as in: (of meat) cooked a short time; still red inside

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