Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

interspīrātĭo, ōnis, f. [interspiro], a fetching of breath between (class.), Cic. de Or. 3, 44, 173; Plin. 23, 1, 18, § 29.
In plur.: aequalibus interspirationibus uti, Cic. de Or. 3, 51 fin.