Do you know? Lethal

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The long-ago lethal meant not simply "capable of causing death"; "of, relating to, or causing death"; but also a specific sort of death—a "spiritual death. (please watch lethal weapon)" That sense is now archaic, but lethal still describes something that is bound to cause death or that exists for the destruction of life (lethal gas).The term lethal has its roots in letum, a Latin term for "death," but was influenced by the Greek Lethe meaning "forgetfulness." In mythology, those who drank of the River Lethe in Hades (the underworld) would forget the past. We can't forget how many similar-seeming terms for lethal exist in our lexicon.

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Take deadly, for instance. Deadly is the adjective used to describe an established or very likely cause of death (a deadly disease); it was born of a Germanic word meaning "dead." Mortal, which implies that death has occurred or will occur soon (mortal wound), comes from Latin. Remember the Latin mori, meaning "to die"? In addition to developing into mortal, mori also breathed life into the terms mortuary and moribund.

Finally, there's fatal, which, like lethal and mortal, owes a debt to Latin. Fatal stresses the inevitability of what has in fact resulted in death or destruction (the consequences were fatal); the Latin fatum means "prophetic declaration"; "oracle"; "what is ordained by the gods"; "destiny"; "fate."