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.
modality. 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.