Lewis Short
impallesco (inp-), lŭi, 3
* V. inch. n. [in-pallesco], to grow or turn pale in or at any thing (post-Aug.): nocturnis chartis,Pers. 5, 62: eventu impalluit ipse secundo,Stat. Th. 6, 805.
Charlton T. Lewis, Charles Short, A Latin Dictionary