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¦
For the UK TV series, see Breeze Block (TV series). Breezeblocks redirects here. For the song by Alt+J, see Breezeblocks (song). A concrete masonry unit (CMU) is a large rectangular block used in building construction. Those that use cinders (fly ash or bottom ash) are called cinder blocks in Canada, the United States, and New Zealand, breeze blocks (breeze is a synonym of ash) in the United Kingdom and New Zealand, and hollow blocks in the Philippines.