דניאל יא:מג
וּמָשַׁ֗ל בְּמִכְמַנֵּי֙ הַזָּהָ֣ב וְהַכֶּ֔סֶף וּבְכֹ֖ל חֲמֻד֣וֹת מִצְרָ֑יִם וְלֻבִ֥ים וְכֻשִׁ֖ים בְּמִצְעָדָֽיו:

 מכמן from the root כמן, meaning to hide, and referring here to treasures.  According to HALOT it is an Aramaic loan-word.

The root occurs in Rabbinic Hebrew (referring to food that is hidden in the ground, e.g. Mishna Ma`asrot 4:1 or witnesses who are hidden, e.g. Mishna Sanhedrin 7:10) as well as Rabbinic Aramaic.