Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vĭŏlārĭum, ii, n. [viola], a bed or bank of violets, Varr. R. R. 1, 35, 1; Verg. G. 4, 32; Hor. C. 2, 15, 5; Ov. F. 4, 437; Col. 10, 259.