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Ancient; pertaining to the earliest period in geological history.

Of or pertaining to the earliest Stone age; -- applied to a prehistoric period preceding the Paleolithic age.

Like, or imitative of, anything archaic; pertaining to an archaism.

Of or pertaining to archangels; of the nature of, or resembling, an archangel. Milton.

Of or pertaining to an archduke or archduchy.

Of or pertaining to an archetype; consisting a model (real or ideal) or pattern; original. "One archetypal mind." Gudworth.

Of or pertaining to an archdeacon. This offense is liable to be censured in an archidiaconal visitation. Johnson.

Of or pertaining to an archbishop; as, Canterbury is an archiepiscopal see.

A violet dye obtained from several species of lichen (Roccella tinctoria, etc.), which grow on maritime rocks in the Canary and Cape Verd Islands, etc. Tomlinson.

Of or pertaining to the satiric Greek poet Archilochus; as, Archilochian meter.

Of or pertaining to Archimedes, a celebrated Greek philosopher; constructed on the principle of Archimedes' screw; as, Archimedean drill, propeller, etc. Archimedean screw, or Archimedes' screw, an instrument, said to have been invented by Archimedes, for raising water, formed by winding a flexible tube round a cylinde…

Of or pertaining to an archipelago.

Pertaining to a master builder, or to architecture; evincing skill in designing or construction; constructive. "Architectonic wisdom." Boyle. These architectonic functions which we had hitherto thought belonged. J. C. Shairp.

Of or pertaining to the art of building; conformed to the rules of architecture. -- Ar`chi*tec"tur*al*ly, adv.

Pertaining to, or contained in, archives or records. Tooke.

Pertaining to, or situated under, the northern constellation called the Bear; northern; frigid; as, the arctic pole, circle, region, ocean; an arctic expedition, night, temperature.

Of or pertaining to arctic lands; as, the arctogeal fauna.

Of or pertaining to an arc. Arcual measure of an angle (Math.), that in which the unit angle has its measuring arc equal to the radius of the circle.

Of or pertaining to an area; as, areal interstices (the areas or spaces inclosed by the reticulate vessels of leaves).

Of or pertaining to sandstone; as, arenilitic mountains. Kirwan.