From a form of naos and koreo (to sweep); a temple-servant, i.e. (by implication) a votary -- worshipper.
see GREEK naos
1. properly, one who sweeps and cleans a temple.
2. one who has charge of a temple, to keep and adorn it, a sacristan: Xenophon, an. 5, 3, 6; Plato, legg. 6, p. 759 a.
3. the worshipper of a deity (οὕς i. e. the Israelites ὁ Θεός ἑαυτῷ νεωκορους ἦγεν through the wilderness, Josephus, b. j. 5, 9, 4); as appears from coins still extant, it was an honorary title (temple-keeper or temple-warden (cf. 2 above)) of certain cities, especially of Asia Minor, in which the special worship of some deity or even of some deified human ruler had been established (cf. Stephanus, Thesaurus, v., p. 1472f; (cf. B. D., under the word worshipper)); so νεωκόρος ... τῆς Ἀρτέμιδος, of Ephesus, Acts 19:35; (see Lightfoot in Contemp. Rev. for 1878, p. 294f; Wood, Discoveries at Ephesus (Lond. 1877), Appendix, passim).