esoteric
‘inner, secret’
Lexical development traced from the Tamil root:
Gk. esoterikos ‘belonging to an inner circle’ < esotero ‘more, within’ < eso ‘within’ < ens-o- < ens < ees < en < Tamil il-iṉ
esoteric
English words derived from Tamil il-iṉ connoting 'attaining'