optimism, n. The doctrine, or belief, that everything is beautiful, including what is ugly, everything good, especially the bad, and everything right that is wrong. It is held with greatest tenacity by those most accustomed to the mischance of falling into adversity, and is most acceptably expounded with disproof - an intellectual disorder, yielding to no treatment but death. It is hereditary, but fortunately not contagious.
NOUMENON, n. That which exists, as distinguished from that which merely seems to exist, the latter being a phenomenon. The noumenon is a bit difficult to locate; it can be apprehended only by a process of reasoning - which is a phenomenon.
Botany, n. The science of vegetables - those that are not good to eat, as well as those that are. It deals largely with their flowers, which are commonly badly designed, inartistic in color, and ill-smelling.