Origin of Lethal
From Latin lÄ“tālis (“mortal, deadly"), improperly written lethalis, from letum (“death"), improperly written as lethum, as associated with Greek λήθη (lethe, “forgetfulness").
Late Latin lēthālis alteration (probably influenced by Lēthē Lethe) of Latin lētālis from lētum death
From American Heritage Dictionary of the English Language, 5th Edition
Abbreviation of “lauric acid ethereal salt", so called because it occurs in the ethereal salt of lauric acid.
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