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The word ethnicos could not be parsed. Trying a normal dictionary lookup:
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ethnĭcālis, e, adj., heathenish, pagan: litterae, Tert. Spect. 5.
ethnĭcē, adv., v. the foll. fin.
† ethnĭcus, a, um, adj., = ἐθνικός, heathenish, pagan; and subst.: ethni-cus, i, m., a heathen, Tert. Pud. 9; Vulg. Matt. 5, 47; 18, 17.
Adv.: ethnĭce, heathenishly: vivere, Tert. Pud. 9.