Any weapon that causes death.
"This definition describes a chemical compound, but no such substance named "lethal" exists in chemistry; therefore, it is impossible to write an example sentence that demonstrates this meaning because the term itself does not refer to one of the higher alcohols obtained from spermaceti."
One of the higher alcohols of the paraffine series obtained from spermaceti as a white crystalline solid.
"The lethal dose was far too small for anyone to recover from."
Usage: Use this term only in technical contexts referring to specific high-alcohol compounds derived from spermaceti, not for general descriptions of deadly weapons or substances. In everyday language regarding fatal objects or agents, the adjective "lethal" is standard rather than the noun form.
Deadly; mortal; fatal.
"The pilot's mistake proved lethal when his plane crashed into the mountainside, killing everyone on board."
The word lethal entered English via Latin in the sense of "deadly" or "fatal." It originally came from letum, meaning death, though its spelling was later influenced by a mistaken link to an Ancient Greek root for oblivion.