Adjective
1. not widely known; especially valued for its uncommonness;
"a rare word""rare books"2. recurring only at long intervals;
"a rare appearance""total eclipses are rare events"3. not widely distributed;
"rare herbs""rare patches of gree in the desert"4. 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""an uncommon sense of humor""she was kind to an uncommon degree"5. having low density;
"rare gasses""lightheaded from the rarefied mountain air"6. (of meat) cooked a short time; still red inside;
"rare roast beef"