See: impervious
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Etymology: From Latin impenetrabilis (impenetrable), referring to the firm soil layer covering the body of all specimens examined.
impenetrabilis, both the dorsal and the ventral surfaces of the abdomen are ornamented with highly elevated carinae (Figs 2, 15).
The sources of this dynamistical concept of impenetrability may be found in Leibniz's Specimen dynamicum (part 1, [section] 1) and in Baumgarten's Metaphysica, the textbook Kant used for his lectures: "Substantia, in cuius loco nequit esse alia extra earn posita, est impenetrabilis (solida)"; Metaphysica, [section] 398.