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.
noun, plural modalities. 1. the quality or state of being modal. 2. an attribute or circumstance that denotes mode or manner. 3. Also called mode. Logic. the classification of propositions according to whether they are contingently true or false, possible, impossible, or necessary.