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.
modal (plural modals) ( 1 logic) A modal proposition. ( 2 linguistics) A modal form, notably a modal auxiliary. ( 3 graphical user interface) A modal window, one that cannot be closed until a decision is made.