Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
lăpĭo, īre, v. a. [lapis], to turn into stone, make hard like stone, to petrify, harden (ante-class.): lapit significat obdurefacit et lapidem facit. Pacuvius Periboea: lapit cor cura, Non. 23, 7 sq. (Pac. Fragm. Trag. v. 276 Rib.): lapit dolore afficit, Paul. ex Fest. p. 118 Müll.