Source : Webster's Revised Unabridged Dictionary (1913)

Carbonado \Car`bo*na"do\, n.; pl. {Carbonadoes}. [Pg.,
   carbonated.] (Min.)
   A black variety of diamond, found in Brazil, and used for
   diamond drills. It occurs in irregular or rounded fragments,
   rarely distinctly crystallized, with a texture varying from
   compact to porous.

Source : WordNet®

carbonadoes
     See {carbonado}

carbonado
     n 1: an inferior dark diamond used in industry for drilling and
          polishing [syn: {black diamond}]
     2: a piece of meat (or fish) that has been scored and broiled
     [also: {carbonadoes} (pl)]