CORUNDUM

Pronunciation (US): (GB):

Meaning:

Very hard mineral used as an abrasive

Synonyms:

corundom; corundum

Classified under:

Nouns denoting substances

Hypernyms ("corundum" is a kind of...):

mineral (solid homogeneous inorganic substances occurring in nature having a definite chemical composition)

Hyponyms (each of the following is a kind of "corundum"):

alumina; aluminium oxide; aluminum oxide (any of various forms of aluminum oxide occurring naturally as corundum)

ruby (a transparent deep red variety of corundum; used as a gemstone and in lasers)

sapphire (a precious transparent stone of rich blue corundum valued as a gemstone)

Holonyms ("corundum" is a substance of...):

emery (a hard grey-black mineral consisting of corundum and either hematite or magnetite; used as an abrasive (especially as a coating on paper))