archaean
‘of or pertaining to crystalline rocks of Pre-Cambrian age’
Lexical development traced from the Tamil root:
Gk. arkhaios ‘ancient’ < arkhē ‘beginning’ < arkhein ‘to be the first, to begin,’ ‘to rule’ < uhk < Tamil aracaṉ
archaean
English words derived from Tamil aracaṉ connoting 'rule'