naked virus, nonenveloped virus a virus lacking an outer lipoprotein bilayer. neurotropic virus one that has a predilection for and causes infection in nervous tissues, e.g., the rabies virus. Norwalk virus a calicivirus that is a common agent of epidemics of acute gastroenteritis. oncogenic viruses an epidemiologic class of viruses that are acquired by close contact or injection and cause usually persistent infection; they may induce cell transformation and malignancy.
Define stumbling block: an obstacle to progress; an impediment to belief or understanding : perplexity â stumbling block in a sentence an obstacle to progress; an impediment to belief or understanding : perplexityâ¦
Wiktionary (0.00 / 0 votes) Rate this definition: city block (Noun). The smallest part of a town enclosed by streets. city block (Noun). The distance from one street to the next. city block (Noun). A distance comparable to the distance between streets in a city, in the approximate range of 0.2u20130.4 km.