biothermal en · ADJ
Etymology
From bio- + thermal.
Meanings
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(not-comparable) Of or pertaining to heat generated by biological processes.
But some environmentalists said they were unhappy that the bill would not provide large incentives for expansion of renewable energy sources like wind, solar and biothermal.
2007 December 14, John M. Broder, “Industry Flexes Muscle, Weaker Energy Bill Passes”, in New York Times: