Tapeworms are flat worms that live in a person's digestive tract. They can grow to more than 82 feet (30 meters) and live as long as 30 years. Tapeworms are parasites. As you probably know from biology class, parasites are organisms that live in, or on, other organisms (called hosts).
Gluon definition, an unobserved massless particle with spin 1 that is believed to transmit the strong force between quarks, binding them together into baryons and mesons. See more. Dictionary.com
Muon. The muon is a lepton which decays to form an electron or positron. The fact that the above decay is a three-particle decay is an example of the conservation of lepton number; there must be one electron neutrino and one muon neutrino or antineutrino in the decay. The lifetime of the muon is 2.20 microseconds.