Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
irrūfo (inr-), āvi, ātum, 1, v. a. [inrufo], to make red (post-class.): capillum, Hier. Ep. 107, n. 5: barba facta irrufata, Tert. Apol. 22.