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| a fool or simpleton; ninny. |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| alternative energy | |
| —n | |
| Also called: renewable energy a form of energy derived from a natural source, such as the sun, wind, tides, or waves | |
alternative energy
usable energy derived from replenishable sources such as the Sun (solar energy), wind (wind power), rivers (hydroelectric power), hot springs (geothermal energy), tides (tidal power), and biomass (biofuels).
Learn more about alternative energy with a free trial on Britannica.com.