noun
or fi·da'i or fi·dai fiˈdäˌē ; also fi·da·wi -äwē ; or fe·dai -äˌē
( plural fida'is or fida'is or fidai or fidais also fidawi or fidawis or fedai or fedais )
Usage: sometimes capitalized
Etymology: Persian fidā'ī
: a member of an Ismaili order of assassins known for their willingness to offer up their lives in order to carry out delegated assignments of murdering appointed victims