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.
Undergraduate, as stated, is often 12 semester credits or more. Half time should be at least 6 credits -- the minimum often needed to be eligible for financial aid. If you are in graduate school, half time is considered 5 or 6 credits, full time is at least 9 credit hours. (This pertains to schools in the US, at least state-run colleges and universities). When I was studying one or two units per semester where considered part-time.