Relating to or pertaining to ergs; measured in or expressed using ergs as a unit.
From the noun 'erg' plus the adjective suffix '-al,' following the standard pattern of creating adjectives from scientific units (as in 'thermal,' 'digital,' 'spectral').
Most scientists today don't use the word 'ergal' because the erg itself is so rarely used—it's a fossil word in scientific terminology, preserved only in older physics texts and the occasional crossword puzzle.
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