Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* sē-dĕcĭes, num. adv. [sex-decies], sixteen times: sedecies ad eorum filios sedecies computatos, Dig. 38, 10, 10, § 18; Rutil. Claud. Itin. 1, 135.