Lewis Short
mortŭrĭo, ire, 4
* V. n. desid. [mors], to long for death, desire to die: dictum est a Cicerone de philosophis, morturiunt, mori desiderant, Aug. de Gram. p: 2006 P. (Cic. Fragm. 50, 29, p. 146 B. and K.).
Charlton T. Lewis, Charles Short, A Latin Dictionary