Knowledge center. Chickenpox (Chicken Pox) , also known as Varicella, is a very contagious infection caused by the varicella zoster virus. In several parts of the world it is just known as varicella. Patients develop a blister-like rash, which first appears on the face and trunk, and then spreads throughout the body.
Etymology[edit] Latin. See mode. modus â(plural modi) (law, obsolete) The arrangement of, or mode of expressing, the terms of a contract or conveyance.
Usus (from Latin: usus â usage; long-established rule, practice, custom) â widely accepted usage of linguistic units (words, idioms, forms). On one hand, it is set off occasional usage and, from the other hand, also language norm. Sometimes the term usus implies particular norms differing from literary norm (e.g. professional or social norms).