Definition of ballas in English:


Pronunciation /ˈbaləs/


  • A tough aggregate of minute, concentrically arranged diamond crystals, occurring naturally in rounded masses especially in Brazil and South Africa, and mined or produced synthetically for industrial purposes.


1930s; earliest use found in Science. From Portuguese balas, ballas, specific use (although the form with medial -ll- is unexplained) of the plural of bala ball, bullet, with reference to the round shape of the crystal aggregate.