ἀρχαῖος
arkhaîos
“ancient, from the beginning”
3 words in English grow from this root.
Archaeology
Scienceἀρχαῖοςarkhaîos
“discourse about old things”
Archaeopteryx
Natureἀρχαῖοςarchaîos
“ancient wing”
Archaism
Wordsἀρχαῖοςarkhaîos
“the practice of the old”