Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
occa, ae, f. [occo], a harrow (post-class.); occa rastrum, Gloss. Isid.: occa βωλοκόπημα, Gloss. Philox.; Veg. Vet. 1, 56.
occo, āvi, ātum, 1, v. a. [root ac, acuo; cf. Germ. eggen, to harrow], to harrow: occare et occatorem Verrius dictum putat ab occaedendo, quod caedat grandis globos terrae: cum Cicero venustissime dicat ab occaecando fruges satas, Paul. ex Fest. p. 181 Müll.: segetes, Hor. Ep. 2, 2, 161: silicia et phasioli occantur tantum, Plin. 18, 21, 50, § 186.
Absol.: nam semper occant prius quam sarriunt rustici, Plaut. Capt. 3, 5, 5.
Of vineyards, to break up and level the ground which has been dug up: occare, id est comminuere, Varr. R. R. 1, 31; Pall. 6, 4, 1.