copepod, copepod crustacean - minute marine or freshwater crustaceans usually having six pairs of limbs on the thorax; some abundant in plankton and others parasitic on fish mussel shrimp, ostracod, seed shrimp - tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shell
time and a half(noun) a rate of pay that is 1.5 times the regular rate; for overtime work.
Best Answer: The definition of half life is the amount of time it takes for half the material to decay. It doesn't matter how much material you start with or the mode by which it decays. In 12 years, half of the hydrogen-3 atoms will become helium-3.