Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
spīrācŭlum, i, n. [spiro], a breathinghole, air-hole, vent, spiracle (poet. and in post-Aug. prose), Lucr. 6, 493; Verg. A. 7, 568; Plin. 2, 93, 95, § 208; Val. Fl. 3, 553; Pall. Jun. 7, 8; id. Oct. 14, 16.
Also breath: vitae, Vulg. Gen. 2, 7; 7, 22.