A type of lightweight material or substance developed for use in specialized applications where minimal weight is critical.
From Latin 'extra' (outside/beyond) + 'lite' (light, from Old English). This appears to be a specialized or proprietary term, possibly from mid-20th century materials science.
Extralite compounds and composites were experimental materials designed to achieve the impossible—maximum strength with minimum weight—making them early precursors to modern aerospace materials!
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