Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
in-cūdo, di, sum, ĕre, v. a., to forge with the hammer, to fabricate (poet., used only in part. pass.): incusa auro dona, Pers. 2, 52: lapis, an indented or sharpened stone for a handmill, Verg. G. 1, 275; Col. 7, 1, 3.