Ununpentium
Definition: Ununpentium is a noun that refers to a chemical element with the symbol Uup and atomic number 115. It is a synthetic (man-made) element that is radioactive and belongs to a group known as transuranic elements, which are elements with atomic numbers greater than that of uranium.
Ununpentium is a chemical element that is part of specialized scientific language. It's important when studying chemistry but is not commonly used in everyday conversation.