Archaean :: Archaean (a.) Ancient; pertaining to the earliest period in geological history.
Archaean :: Archaean (n.) The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life..
Archaeography :: Archaeography (n.) A description of, or a treatise on, antiquity or antiquities..
Archaeolithic :: Archaeolithic (a.) Of or pertaining to the earliest Stone age; -- applied to a prehistoric period preceding the Paleolithic age.
Archaeological :: Archaeological () Relating to archaeology, or antiquities; as, archaeological researches..
Archaeologist :: Archaeologist (n.) One versed in archaeology; an antiquary.
Archaeology :: Archaeology (n.) The science or study of antiquities, esp. prehistoric antiquities, such as the remains of buildings or monuments of an early epoch, inscriptions, implements, and other relics, written manuscripts, etc..
Archaeopteryx :: Archaeopteryx (n.) A fossil bird, of the Jurassic period, remarkable for having a long tapering tail of many vertebrae with feathers along each side, and jaws armed with teeth, with other reptilian characteristics..
Archaeostomatous :: Archaeostomatous (a.) Applied to a gastrula when the blastopore does not entirely close up.
Archaeozoic :: Archaeozoic (a.) Like or belonging to the earliest forms of animal life.
Archaic :: Archaic (a.) Of or characterized by antiquity or archaism; antiquated; obsolescent.