What does archaea mean?

archaea meaning in Urban Dictionary

(plural) unicellular microorganisms. The singular kind is archaeon.

archaea meaning in Medical Dictionary

a distinctive selection of microorganisms that are called germs (Archaeobacteria) but are genetically and metabolically not the same as all the known micro-organisms. They be seemingly residing fossils, the survivors of an ancient selection of organisms that bridged the space in development between germs and multicellular organisms (eukaryotes).