Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sīphuncŭlus, i, m. dim. [sipho], a little pipe from which water springs forth, Plin. Ep. 5, 6, 23; 5, 6, 36.
Also written without the aspirate, sīpuncŭlus, Fronto, Or. 1 med.