Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

lăpăthĭum, i, v. lapathum.

lăpăthum, i, n., and lăpăthus, i, f. (m., Lucil.; v. infra. Ante-class. collat. form lăpăthĭum, ii, Varr. ap. Non. 550, 17; id. L. L. 5, § 103 Müll.), n., = λάπαθον or λάπαθος, sorrel.
Form lapathum, Plin. 20, 21, 85, § 231.
Form lapathus, Col. poët. 10, 373.
In masc., Lucil. ap. Cic. Fin. 2, 8, 24.
In a dub. form: lapathi brevis herba, Hor. S. 2, 4, 29; id. Epod. 2, 57.

Lăpăthüs, untis, f., a fort or castle in Thessaly, at Tempe, Liv. 44, 2; 6.