Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† cannăbis, is, f., and cannăbum, i, n. [kindr. with Sanscr. sana, the same, Bopp, Gloss. p. 343, a], = κάνναβις and κάνναβος, hemp; nom. cannabis, Col. 2, 10, 21; Plin. 19, 4, 22, § 63; 19, 9, 56, § 173; acc. cannabim, Varr. R. R. 1, 23, 6; abl. cannabi, Plin. 19, 2, 8, § 29: cannabe, Pers. 5, 146.
Nom. cannabum, Isid. Orig. 19, 27, 3; gen. cannabi, Isid. l. l. 2; acc. cannabum, Pall. Febr. 5; Mart. 5; Isid. l. l. 3; abl. cannabo, Varr. ap. Gell. 17, 3, 4.