Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
in-frĭo, āvi, ātum, 1, v. a., to rub into, crumble into, strew upon: farinam in aquam, Cato, R. R. 156: papaver, id. ib. 79; Cels. 7, 12: seni papaverem, Varr. ap. Non. 220, 11: ruta infriata, Plin. 20, 13, 51, § 140.