Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
trans-fŏdĭo, fōdi, fossum, 3, v. a., to thrust or run through, to stab through, transfix, transpierce (class., but not in Cic.): Galli in scrobes delapsi transfodiebantur, * Caes. B. G. 7, 82: deinde fugienti latus transfodisse, Liv. 39, 42, 12: transfosso oculo, Tac. A. 3, 20 fin.: cochlea acu transfossa, Plin. 30, 4, 11, § 31.
In a Greek construction: pectora duro Transfossi ligno, Verg. A. 9, 544.