Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word carduus could not be parsed. Trying a normal dictionary lookup:
No entries found. Showing closest matches:
cardŭēlis, is, f. [carduus], the thistlefinch, goldfinch: Fringilla carduelis, Linn.; Plin. 10, 42, 57, § 116; Petr. 46, 4; cf. Serv. et Prob. Verg. G. 3, 338; Isid. Orig. 12, 7, 74.
cardŭētum, i, n. [carduus], a thicket of thistles, Pall. Mart. 9, 4.
cardu .s, i (access. form cardus, ūs, Edict. Diocl. p. 17; cf. Charis. p. 57 P.), m., the thistle.