'retroviral

World English Dictionary
retrovirus (ˈrɛtrəʊˌvaɪrəs) [Click for IPA pronunciation guide]
 
n
any of several viruses whose genetic specification is encoded in RNA rather than DNA and that are able to reverse the normal flow of genetic information from DNA to RNA by transcribing RNA into DNA: many retroviruses are known to cause cancer in animals
 
'retroviral
 
adj

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00:10
'retroviral is always a great word to know.
So is interrobang. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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