Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
brĕvĭlŏquĭum, ii, n. [brevis-loquor], brevity in speech, Prisc. p. 754 P.; Fulg. Myth. praef. fin.; Serv. ad Verg. A. 1, 561.