annihilate

Concise Oxford English Dictionary © 2008 Oxford University Press:
annihilate /əˈnʌɪɪleɪt/

▶verb

• 1 destroy utterly.

  ■ defeat utterly.

• 2 Physics convert (matter) into radiant energy, especially by collision of a particle with an antiparticle.

– derivatives
annihilation noun,
annihilator noun.

– origin ME: from late L. annihilat-, annihilare ‘reduce to nothing’.