ret ‧ ro ‧ vi ‧ rus /ˈretrəʊˌvaɪərəs $ -troʊˌvaɪrəs/ BrE AmE noun [countable] technical
a ↑ virus of a type that includes some ↑ cancer viruses and the ↑ AIDS virus, but that also has a quality that makes it useful for ↑ genetic engineering
ret ‧ ro ‧ vi ‧ rus /ˈretrəʊˌvaɪərəs $ -troʊˌvaɪrəs/ BrE AmE noun [countable] technical
a ↑ virus of a type that includes some ↑ cancer viruses and the ↑ AIDS virus, but that also has a quality that makes it useful for ↑ genetic engineering
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012