dissipate

Concise Oxford English Dictionary © 2008 Oxford University Press:
dissipate /ˈdɪsɪpeɪt/

▶verb

• 1 be or cause to be dispelled or dispersed.

• 2 waste (money, energy, or resources).

• 3 Physics cause (energy) to be lost through its conversion into heat.

– derivatives
dissipative adjective,
dissipator (also dissipater) noun.

– origin ME: from L. dissipat-, dissipare ‘scatter’.