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.
Definition of MODAL. 1. : of or relating to modality in logic. 2. : containing provisions as to the mode of procedure or the manner of taking effect âused of a contract or legacy. 3. : of or relating to a musical mode. 4. : of or relating to structure as opposed to substance. 5.