Wordnet 3.0
NOUN (1)
1.
very hard mineral used as an abrasive;
[syn: corundom, corundum]
The Collaborative International Dictionary of English v.0.48:
corundom \corundom\ n.
a very hard mineral used as an abrasive; same as corundun.
Syn: corundum.
[WordNet 1.5]