Related Terms. Long-term (maturity over 10 years) fixed interest rate debt security issued by a national (federal) government backed by its 'full faith and credit.' Next to treasury bills (maturity less than one year), and treasury notes (maturity one to ten years) T-bonds are the safest form of marketable investment.
bacteria [pl. of bacterium], microscopic unicellular prokaryotic organisms characterized by the lack of a membrane-bound nucleus and membrane-bound organelles. Once considered a part of the plant kingdom, bacteria were eventually placed in a separate kingdom, Monera.
Noun. 1. microorganism-any organism of microscopic size. micro-organism. organism, being-a living thing that has (or can develop) the ability to act or function independently.animal, animate being, beast, creature, fauna, brute-a living organism characterized by voluntary movement.icroorganism-any organism of microscopic size. micro-organism. organism, being-a living thing that has (or can develop) the ability to act or function independently. animal, animate being, beast, creature, fauna, brute-a living organism characterized by voluntary movement.