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
a definition of a compound word is jack-ass.
The word that goes with that definition is "door."