rare

adjective

1. 1

   not widely distributed

   rare herbs

   rare patches of green in the desert

2. 2

   not widely known; especially valued for its uncommonness

   a rare word

   rare books

3. 3

   (of meat) cooked a short time; still red inside

   rare roast beef

4. 4

   recurring only at long intervals

   a rare appearance

   total eclipses are rare events

5. 5

   marked by an uncommon quality; especially superlative or extreme of its kind

   what is so rare as a day in June"-J.R.Lowell

   a rare skill

6. 6

   having low density

   rare gasses

   lightheaded from the rarefied mountain air