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The word tribulare could not be parsed. Trying a normal dictionary lookup:
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trībŭla, ae, v. tribulum.
trībŭlātĭo, ōnis, f. [tribulo], distress, trouble, tribulation (eccl. Lat.), Tert. adv. Jud. 11; Aug. in Psa. 125, 2; Hier. Ep. 108, 18.
trībŭlātus, a, um, adj. [tribulum], pointed, toothed like a threshing-sledge: falciculae, Pall. 1, 43, 8.
trībŭlum (trīvŏl-), i, n. [tero], a threshing-sledge, consisting of a wooden platform studded underneath with sharp pieces of flint or with iron teeth, Varr. L. L. 5, § 21 Müll.; id. R. R. 1, 22, 1; 1, 52, 1; Plin. 18, 30, 72, § 298; Verg. G. 1, 164.
Collat. form trībŭla, ae, f., Col. 2, 20, 4; 1, 6, 23; 12, 52, 7; Vulg. 1 Par. 20, 3.