ancient; antediluvian; archaic; old; prehistoric; primitive

(astronomy, archaeology) The historical, especially archeological, study of astronomy; the study of the astronomical systems and methods of ancient cultures often embracing the astrology and cosmology of the past.

Misspelling of archaeological.

ancient, early, primitive

(geology) Of, or relating to the geologic eon from about 3,800 to 2,500 million years ago; comprises the Eoarchean, Paleoarchean, Mesoarchean and Neoarchean eras; marked by an atmosphere with little oxygen, the formation of the first continents and oceans and the emergence of simple life.

(geology) The eon from 2,500 Ma to 4,000 Ma.

plural of archaeon

(biology) Any organism of the domain Archaea.

plural of archaebacterium

Any primitive bacteria-like organism in the kingdom Archaea.