From BiblePortal Wikipedia

Vine's Expository Dictionary of NT Words [1]

1: Διώκτης (Strong'S #1376 — Noun Masculine — dioktes — dee-oke'-tace )

akin to dioko (see above), occurs in  1—Timothy 1:13 .

King James Dictionary [2]

PER'SECUTOR, n. One that persecutes one that pursues another unjustly and vexatiously, particularly on account of religious principles.

Henry rejected the pope's supremacy, but retained every corruption beside, and became a cruel persecutor.

Webster's Dictionary [3]

(n.) One who persecutes, or harasses.