1. So extremely old as seeming to belong to an earlier period
   "archaic laws"
   - antediluvian, antiquated 
2. Little evolved from or characteristic of an earlier ancestral type
   "archaic forms of life"
   - primitive

See also: early, old

Encyclopedia: Archaic

• open-hearth
• open-hearth furnace
• open-hearth process
• open-minded
• open-mindedly
• open-mindedness
• open-plan
• open-source
• openbill
• opencast
• opencast mining
• opencut
• opened
• opener
• openhanded
• openhandedness
• openhearted
• opening
• opening line
• opening move
• opening night
• openly
• openmouthed
• openness
• openside plane