BLACK DIAMOND

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

An inferior dark diamond used in industry for drilling and polishing

Synonyms:

black diamond; carbonado

Classified under:

Nouns denoting substances

Hypernyms ("black diamond" is a kind of...):

adamant; diamond (very hard native crystalline carbon valued as a gem)

Credits