Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
infurnĭbŭlum, i, n. [in-furnus], a funnel for inhaling smoke: is nidor per infurnibulum imbibitur in tussi, Plin. 24, 15, 85, § 135 (Jahn and others read infundibulum; Gloss. Philox. infumibulum καπνοδόχη).