ballas

noun
bal·​las | \ˈbaləs\
plural ballas

Definition of ballas 

: a nearly spherical aggregate of diamond grains having a radial or granular structure and used as an industrial diamond because of a toughness that is due to the lack of throughgoing cleavage planes

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History and Etymology for ballas

probably from Portuguese balas, plural of bala, literally, ball, bullet, from Italian palla, of Germanic origin; akin to Old High German balla ball

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