Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rŭtābŭlum, i, n. [ruo], an instrument for raking or stirring up. 
- I.  Lit. 
- A.  For fire, a fire-shovel, oven-rake, Cato, R. R. 10, 3; 11, 5; Novat. ap. Fest. p. 262 Müll. (Com. Rel. p. 226 Rib.); Suet. Aug. 75.
- B.  For cookery, a wooden shovel or spattle for stirring and mixing liquids, Col. 12, 20, 4; 12, 23, 2.
- * II.  Transf.,  =  membrum virile, Naev. ap. Fest. p. 262 Müll. (Com. Rel. p. 24 Rib.).