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lethiferous

[li-thif-er-uh s]
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adjective Archaic.
  1. lethal.
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Origin of lethiferous

1645–55; < Latin lētifer (lēti-, combining form of lētum death (see lethal) + -fer bearing) + -ous; see -ferous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018