empyrical en · ADJ
Etymology
From Latin empyricus, from Ancient Greek ἐμπύριος (empúrios, “fiery”), from ἐν (en, “en-”) + πῦρ (pûr, “fire”).
Meanings
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(not-comparable) Containing the combustible principle of coal.
, if it be rich , they will not extend above five or six inches ; but of these and some other empyrical marks , I shall say no more , as they do not tell us the defects of the soils
1796, Richard Kirwan, The Manures Most Advantageously Applicable to the Various Sorts of Soils: