rarer

1. not widely known; especially valued for its uncommonnessExamples: "a rare word"; "rare books"Synonyms: rare

2. recurring only at long intervalsExamples: "a rare appearance"; "total eclipses are rare events"Synonyms: rare

3. not widely distributedExamples: "rare herbs"; "rare patches of green in the desert"Synonyms: rare

4. having low densityExamples: "rare gasses"; "lightheaded from the rarefied mountain air"Synonyms: rare, rarefied, rarified

5. marked by an uncommon quality; especially superlative or extreme of its kind; -J.R.LowellExamples: "what is so rare as a day in June"; "a rare skill"; "an uncommon sense of humor"Synonyms: rare, uncommon

6. (of meat) cooked a short time; still red insideExamples: "rare roast beef"Synonyms: rare