Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
septĭes (-tĭens), num. adv. [septem], seven times: septies millies sestertium, seven thousand times a hundred thousand sesterces, Cic. Phil. 2, 37, 93; Liv. 28, 6; Plin. 16, 40, 79, § 213; v. sestertius.