a lustrous, silvery-white substance obtained from the scales of certain fishes or derived synthetically, as from mercuric chloride: used chiefly in the manufacture of simulated pearls and as a pigment in lacquer (pearl lacquer).
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Lexical Investigations: Critical Thinking
Though the phrase critical thinking wasn’t coined until the early twentieth century, its principles can be traced back to Aristotle. The educator and psychologist John Dewey first used the phrase in its modern sense in his 1910 book How We Think, though there are instances of the words appearing together in texts before this time. Dewey defined critical thinking as “reflective thought,” requiring healthy skepticism, …
Origin of pearl essence
First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019