Deadly refers to substance or action that has fatal effect. For example syanide is a deadly poison, and hitting someone in the head with an axe would most often be considered to be a deadly action.
Deadly is an adjective.
The Latin word for deadly is mortifera.
I know that a snake's venom is deadly.
cause it has the word deadly in it
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The definition of something describes exactly what the word is and how the word can be used. You will also see synonyms for the word and if the word is a noun or adjective when viewing the definition.
The dictionary definition of a word
what is the definition of word-processing package
The definition of the word cited is quote as evidence for or justification of an argument or statement. Another definition for the word cited is mention as an example.
a definition of a compound word is jack-ass.